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M3.1 the Midpoint and Intercept Theorems

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M3.1 the Midpoint and Intercept Theorems Methods 3.1 The Midpoint and Intercept theorems M3.1 The Midpoint and Intercept theorems Before you start Why do this? You should be able to: Architects have to have an excellentknowledge of prove two triangles congruent geometry. prove two triangles similar use properties of similar triangles. Objective Get Ready You can understand the midpoint theorem and 2x the intercept theorem. You can use the midpoint theorem and the 84° x 54° 2z intercept theorem. a 54° 2y 42° 1 a The two triangles are similar explain why. b Write a in terms of x or y or z. 2 Solve these equations: t 9 5 4 a __ __ b __ __ 4 2 s 9 Key Points The Intercept theorem P A B C D X Y The lines PX and PY cut a pair of parallel lines at A, C and B, D respectively. PA PB AB Then: ___ ___ ___ PC PD CD The Midpoint theorem A special case of the converse of the intercept theorem is the midpoint theorem. In the triangle PAB, A and B are the midpoints of the sides AB and CD. P Then the line AB is parallel to the side CD of the triangle and is equal to half its length. AB C D 1 Chapter 3 The Midpoint and Intercept theorems Example 1 P A 6 cm B 4.5 cm 10 cm C D X Y Find the length of PB. This problem should be solved algebraically. PA PB AB Using the intercept theorem: ___ ___ ___ PC PD CD Let the length of PB x cm. Use the last two fractions with PB x 6 ______ __ x and so PD x 4.5 x 4.5 10 10x 6(x 4.5) Multiply through by 10(x 4.5) and cancel. x 6 4.5 4 6.75 Exercise 3A (All diagrams not to scale) A 1 P 6 cm AB 4 cm 9 cm C D Find the length of PB. 2 P 12 cm WY 7 cm 16 cm X Z Find the length of PY. 3 A 5 cm B C 6 cm 8 cm D E Find the length of AE. 2 Methods 3.1 The Midpoint and Intercept theorems A 4 A 2 cm 3 cm B C 3 cm D 8 cm E 1 cm F H a Work out the length of BC. b Work out the length of FH. c Work out the length of CE. 5 ABCD is a rectangle. K, L, M and N are the midpoints of AB, BC, CD and DA respectively. Use the midpoint theorem to show that the quadrilateral KLMN is a parallelogram. 6 A 2 cm B 5 cm C 6 cm D E 8 cm F DE 8 cm AD 6 cm AC 2 cm BC 5 cm a Work out the length of CE. b Work out the length of CF. 7 A kite has the property that its diagonals intersect at right angles. A ABCD is a kite. E, F, G, H are the midpoints of the sides AB, BC, CD and DA respectively. Prove that EFGH is a rectangle. 8 A E B C D D is the midpoint of BC. DE is parallel to BA. Show that: a area triangle AED area triangle EDC b area triangle EDC : area triangle ABD 1 : 2 9 P A B X C D A is the midpoint of PC and B is the midpoint of PD. AD and BC intersect at X. Prove that AX : AD 1 : 3 10 ABCD is a parallelogram. M is the midpoint of the diagonal BD and L is the midpoint of BM. X is the point on BC such that LX is parallel to DC. Y is the point on CD such that LY is parallel to BC. Find area LXCY : area ABCD 3 Chapter 3 The Midpoint and Intercept theorems M3.2 Intersecting Chords Before you start Why do this? You should be able to: Architects study the properties of circles so that prove that two triangles are similar they can design structures. recall the angles in the same segment (or angles subtended at the circumference by equal arcs) theorem recall the properties of tangents to circles. Objectives Get Ready You can solve problems which involve 1 Show that the two triangles are 8 cm 6 cm intersecting chords of circles. similar. You can solve problems which involve a chord 2 Find the value of x. 9 cm and a tangent to a circle. x cm Key Points For any chords AB and CD intersecting inside a circle: B C PA PB PC PD. P A D PA PB PC PD B A P C D For any chords AB and CD intersecting outside a circle: PA PB PC PD. Let A, B and T be points on a circle. P is the point of intersection of T the tangent at T and the chord BA. PA PB PT2 P A B 4 Methods 3.2 Intersecting Chords Example 2 B A, B, C and D are 4 points on a circle. DPA and BPC are straight lines. 8 cm A Work out the length of AP. P 6 cm AP 6 8 4.5 AP 36 6 5.5 4.5 cm C Use AP PC BP PD D Example 3 B 11 cm A, B, C and D are points on a circle. PAB and PCD are straight lines. A PA 4 cm. AB 11 cm. PC 5 cm. 4 cm Work out the length of DC. P C 5 cm 4 15 5 PD PD 60 5 12 D CD 12 5 7 cm Use PA PB PC PD Example 4 X X, Y and Z are 3 points on a circle. PYZ is a straight line. PX is a tangent to the circle at X. PX 6 cm, 6 cm YZ 5 cm. Find the length of PZ. P Y 5 cm Z 2 x Use PY PZ PX Let PY cm PZ PY 5 x 5 Expand the brackets and collect 2 2 x(x 5) 6 x 5x 36 0 the terms on the left hand side. (x 9)(x 4) 0 x 9 or x 4 Solve by factorising or using the quadratic formula. PY 4, PZ 9 Select the positive value of x. Exercise 3B (All diagrams not to scale) B 1 A, B, C and D are 4 points on a circle. DPA and BPC are straight lines. A B Work out the length of PD. 6 cm 8 cm P 4 cm D C 5 Chapter 3 The Midpoint and Intercept theorems A 2 W, X, Y and Z are 4 points on a circle. P is the point of intersection of the chords WY and XZ. Z Work out the length of WY. W 9 cm 8 cm P 4 cm Y X 3 W, X, Y and Z are points on a circle. The chords WY and XZ meet inside the circle at P. WP 8 cm, WY 12 cm, XP 5 cm. Work out the length of PZ. 4 Copy and complete the table for the given diagram. AP BP CP DP AB CD B a 9 8 6 C b 10 6 4 P c 8 6 20 d 4 5 29 A e 5 4 15 f 4 7 19 D g 12 9 25 h 9 6 24 5 A, B, C and D are 4 points on a circle. DA 23 cm. DP PA. Work out the length of AP. B A 12 cm P D 5 cm C 6 A, B, C and D are 4 points on a circle. PAB and PCD are straight lines. a Work out the length of PD. b Write down the length of CD. B 6 cm A 10 cm P C 5 cm D 6 Methods 3.2 Intersecting Chords 7 W, X, Y and Z are 4 points on a circle. A PZ 10 cm. Work out the length of YZ. X 6 cm W 6 cm P Z Y 8 A, B C and D are points on a circle. B a Show that x satisfi es the equation x2 30x 216 6 cm b Find the value of x. A 12 cm P x cm C 30 cm D 9 W, X, Y and Z are 4 points on a circle. The lengths of some parts of the diagram are given in the table. Copy and complete the table. PW PX PY PZ WX YZ a 8 15 10 X b 7 8 9 c 6 18 6 W d 15 7 38 e 18 36 30 P Z f 16 8 12 Y g 9 6 22 h 12 24 2 10 O is the centre of the circle. AOB is a diameter. CM MD. AB 10 cm. OM 2 cm. Find the length of CM. A O CD M B 7 Chapter 3 The Midpoint and Intercept theorems A 11 O is the centre of the circle. YOW is a diameter. M is the midpoint of XZ. Y The radius of the circle is c cm. OM a cm. MZ b cm. Show that: c2 a2 b2 O XZ M W 12 O is the centre of the circle. AOB is a diameter. CM MD. MB 4 cm. OM 6 cm. Find the length of AD. A O C M D B 13 In each of the cases copy and complete the table.
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