Perimeter, Area, and Volume SOL 5.8b
Plane figure – any flat, closed shape.
Polygon – a closed plane figure composed of at least three line segments that do not cross.
Perimeter is the path or distance around any plan figure. It is a measure of length.
- When you think perimeter, think of the word AROUND (1)
Examples of Perimeter: 1. A fence AROUND your house.
2. The blue tiles AROUND the classroom.
3. A border AROUND the bulletin board.
Area is the surface included within a plan figure. Area is measured by the number of square units needed to cover a surface or plane figure.
- When you think area, think of the words COVER UP (2).
Examples of Area: 1. COVERING UP your yard with grass.
2. COVERING UP a wall with paint.
3. COVERING UP a bulletin board with paper.
Volume of a three-dimensional figure is a measure of capacity and is measured in cubic units.
- When you think volume, think of the words FILL UP (3).
Examples of Volume: 1. FILLING UP a box with presents.
2. FILLING UP an iPad cart with iPads.
3. FILLING UP a pencil box with supplies.
Finding Perimeter, Area, and Volume SOL 5.8a
Perimeter of any Polygon - To determine the perimeter of any polygon add (+) the lengths of the sides. - Don’t forget to include the measurement label provided!
Examples: A square with 4 in. sides = 16 in.
A rectangle with length of 8 ft. and width of 2 ft. = 20 ft.
Area of a Square or Rectangle - To determine area, multiply the length of the base by the length of the height. - Don’t forget – area is labeled in square units, so you must include that in your measurement label!
Examples: A square with a side of 3 cm = 9 cm2
A rectangle with length of 10 mm and width of 4 mm = 40 mm2
Area of a Right Triangle - A right triangle has one right angle. - To determine area, multiply the base by the height, and then half (÷2) your answer. - Don’t forget – area is labeled in square units, so you must include that in your measurement labe!
Examples:
A right triangle with base of 6 yds and height of 2 yds = 6 yd2
Volume of a Rectangular Prism or Cube - A rectangular prism or cube is a three-dimensional figure. - To determine volume, multiply the length by the width by the height. - Volume is labeled in cubic units so you must include that in your measurement label!
Examples:
A cube with sides of 5 m = 125 m3