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Golden Pentagon AFRICAN INSTITUTE FOR MATHEMATICAL SCIENCES SCHOOLS ENRICHMENT CENTRE (AIMSSEC) AIMING HIGH This INCLUSION AND HOME LEARNING GUIDE suggests related learning activities for all ages from 4 to 18 on the theme of RATIO Just choose whatever seems suitable for your group of learners The original GOLDEN PENTAGON activity was designed for Years 9 to 13 GOLDEN PENTAGON In each of these diagrams of a regular pentagon find the ratio of the length shown in � (�$√�) red to the length in blue in terms of the Golden Ratio � = � Find all the angles in the diagram. Let AE = 1 unit and AR= x units. Which triangles are isosceles? Which triangles are similar? Use similar triangles to give an equation for x and solve the equation. Prove () = � *) Prove () = � (+ Prove �� = � �� Prove �� = ∅ �� HELP You may find it helpful to mark all the angles of 36o in one colour, angles of 54o in another colour and angles of 72o in a third colour. This will help you to see which triangles are isosceles, and also to see which pairs of triangles are similar. Write the ratios in terms of x and 1 + x and simplify the expressions to give quadratic equations. For some of these proofs you will need to manipulate surds. NEXT Using the same diagram write down the value of cos 36o in terms of √5. 2 INCLUSION AND HOME LEARNING GUIDE THEME: RATIO Early Years and Lower Primary – FINDING FIVES Take a strip of paper. Tie it in a knot. Gently pull the knot to close it up and then flatten it out. What do you get? This shape is called a pentagon. Count the edges. Where can you find fives? Look at your hands and feet. Stand like the picture to make a pentagon shape from the top of your head, to your hands, to your feet. Are those lines different lengths or the same? MAKE PENTAGON SHAPES Here are some ideas for pentagon people-shapes In your class in school or in your group at home make as many as you can. 3 Upper Primary Spot the pentagons and pentagon stars (pentagrams) in the pictures below. Copy this pentagram pattern. Make your big pentagram star as large as possible to fit on your sheet of paper. How many stars you can draw inside it? Measure AC and AB. What is the ratio of these lengths? A C B 4 Colour the patterns. What shapes do you see in these patterns? PEOPLE ANGLE MEASURES Five learners make a circle holding hands then step back and stretch their arms so that they make a pentagon. Another learner, called Joy, walks around this pentagon (see the J on the diagram below) . Her path is shown in the diagram by the blue dashed lines. How many angles does she turn through if she ends up facing in the same direction as at the start? What angle does she turn through at each vertex? This angle is called the exterior angle of the pentagon. What is the interior angle in degrees? INTERIOR EXTERIOR ANGLE ANGLE J 5 Lower Secondary PEOPLE ANGLE MEASURES Five learners make a circle holding hands then step back and stretch their arms so that they make a pentagon. Another learner, called Joy, walks around this pentagon (see the J on the diagram below) . Her path is shown in the diagram by the blue dashed lines. How many angles does she turn through if she ends up facing in the same direction as at the start? What angle does she turn through at each vertex? This angle is called the exterior angle of the pentagon. What is the interior angle in degrees? INTERIOR EXTERIOR ANGLE ANGLE J Measure the lengths in this pentagon and work out the following ratios from your measurements: BE : AE BE : BR BE : BS AR : AE AP : PR What do you notice? 6 Now do the diagnostic quiz on page 8 which introduces the idea of the proportions of a rectangle, that is the ratio of the length to the width. As we shall see in Dali’s painting the Golden Rectangle has the proportions of the Golden Ratio �. Look at this painting of the Last Supper, painted by the Spanish artist Salvador Dali in 1955. It is designed to show the Golden Rectangle and the Golden Ratio. Notice also the pentagonal windows that Dali used because of their golden proportions. The yellow frame is a golden rectangle split into a square with Christ at the lower left- hand corner, and another rectangle that is also a golden rectangle. Measure the lengths of the edges. You will find that both rectangles have the � (�$√�) proportions of the Golden Ratio � = � = 1.618 (to 3 decimal places). A series of instructions to fold a pentagon from a sheet of A4 paper: Fold up corner C to corner A. Your paper should now look like this: 7 Now lay edge BE along edge DF to create a mirror line. Mark the crease for the mirror but do not fold: Lastly, fold edge BE to lie on the crease, then fold edge DF to lie on the crease. You should get a pentagon like this. DIAGNOSTIC ASSESSMENT This should take about 5–10 minutes. Write the question on the board, say to the class: “Put up 1 finger if you think the answer is A, 2 fingers for B, 3 fingers for C and 4 fingers for D”. 1. Notice how the learners respond. Ask a learner who gave answer A to explain why he or she gave that answer. DO NOT say whether it is right or wrong but simply thank the learner for giving the answer. 2. It is important for learners to explain the reasons for their answers. Putting thoughts into words may help them to gain better understanding and improve their communication skills. 3. Then do the same for answers B, C and D. Try to make sure that learners listen to these reasons and try to decide if their own answer was right or wrong. 4. Ask the class to vote for the right answer by putting up 1, 2, 3 or 4 fingers. Notice if there is a change and who gave right and wrong answers. The correct answer is: B and G – all squares are similar to each other. Possible misconceptions: Some learners will just guess. Encourage them to look at the square grid and to decide if the proportions are the same. This activity is about the Golden Ratio. All Golden Rectangles ( have edges in the ratio Ø: 1 where Ø = (9$√:) https://diagnosticquestions.com ) https://diagnosticquestions.com 8 Upper Secondary Start with the diagnostic quiz on page 8 which introduces the idea of the proportions of a rectangle, that is the ratio of the length to the width. As we shall see in Dali’s painting the Golden Rectangle has the proportions of the Golden Ratio �. Look at this painting of the Last Supper, painted by the Spanish artist Salvador Dali in 1955. It is designed to show the Golden Rectangle and the Golden Ratio. Notice also the pentagonal windows that Dali used because of their golden proportions. The yellow frame is a golden rectangle split into a square with Christ at the lower left- hand corner, and another rectangle that is also a golden rectangle. Measure the lengths of the edges. You will find that both rectangles have the � (�$√�) proportions of the Golden Ratio � = � = 1.618 (to 3 decimal places). Then do all the proofs given in the worksheets on pages 1 and 2. Key questions • have you found all the angles? • which triangles are isosceles? • have you listed all the pairs of similar triangles? • how would you describe the symmetries of the pentagon/pentagram diagram? • what happens if you draw a pentagram inside the small inner pentagon? Can you repeat this process again and again on a smaller and smaller scale? Try it. 9 Why do this activity? This activity offers a blend of algebra and geometry suitable for 14 year olds and older students. There is scaffolding to guide students to solve the problem using the solutions to a quadratic equation. Learning objectives In doing this activity students will have an opportunity to: • review and deepen their knowledge and understanding of similar triangles; • review and deepen their knowledge and understanding of ratios; • review and deepen their knowledge and understanding of how to solve a quadratic equation; • review and deepen their knowledge and understanding of surds. Generic competences In doing this activity students will have an opportunity to: • develop problem solving skills; • develop visualization skills; • make connections between different topics and use algebra to solve a problem in geometry. Follow up Elephant Dreaming https://aiminghigh.aimssec.ac.za/years-8-12-elephant-dreaming/ One Step Two Steps https://aiminghigh.aimssec.ac.za/years-7-10-one-step-two-steps/ Fibonacci’s Rabbits https://aiminghigh.aimssec.ac.za/years-9-to-13-fibonaccis-rabbits/ Sheep Talk https://aiminghigh.aimssec.ac.za/years-7-12-sheep-talk/ 10 SOLUTION The angles of a regular pentagon are 108° so all the angles can be found. The edges of the regular pentagon are 1 unit and BE = x units. Triangle ABR is isosceles so BA = BR = 1 and RE = x – 1 units. E Triangles ABP and ARE are congruent isosceles triangles. AR = RE = AP = x – 1. 1. Triangles ABE, ABP and ARE are similar (108o, 36o, 36o) hence BE/AE = AB/AP � 1 = 1 � − 1 Hence x2 - x - 1 = 0 and this quadratic equation has solutions ; � = <(9±√:) ; As the lengths must be positive � = <(9$√:) . �> ? 1. BE/AE = � = � �$√� @� the Golden Ratio.
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