1. UNIT 8: 2-D MEASUREMENTS PERIMETER AREA SQUARE RECTANGLE PARALLELOGRAM
TRIANGLE
TRAPEZOID
CIRCLES
COMPLEX SHAPES

2. PERIMETER
ADD ALL SIDES
8 cm
4 cm
8cm + 4cm + 8cm + 4cm = 24 cm

3. AREA - SQUARE
BASE x HEIGHT (length x width)
6 cm
6cm x 6cm = 36 𝑐𝑚 2

4. AREA - RECTANGLE BASE x HEIGHT (length x width) 2 m 10 m
2m x 10m = 20 𝑚 2

5. AREA - PARALLELOGRAM BASE x HEIGHT 5 mm 3.5 mm 4 mm
3.5 mm x 5 mm = 𝑚𝑚 2
HEIGHT
SIDE LENGTH
BASE

6. AREA - TRIANGLE BASE x HEIGHT 2 S = 5 cm H = 4 cm H = 5 cm
B = 6 cm B = 5 cm
Area = Area = 𝑐𝑚 𝑐𝑚 2 s h h b b

7. AREA - TRAPEZOID (BASE 1 + BASE 2) x HEIGHT 2 5 cm 3 cm = 8 cm
(5 cm + 8 cm) x 3 ÷ 2 = 13 x 3 ÷ 2 = 19.5𝑐𝑚 2

8. AREA - CIRCLES AREA = 𝜋 x 𝑟 2 PERIMETER (CIRCUMFERENCE) = 𝜋 x 2r
= 𝜋 x d
4 cm
A = 3.14 x = 3.14 x 16 = 𝑐𝑚 2 P = 3.14 x 8 = cm

9. AREA – COMPLEX SHAPES Divide the complex shape into a known shape.
Find the area for each part.
Add all the parts A B C D

10. AREA – COMPLEX SHAPES
AREA =
4.5m m 2m A B C D

11. AREA – COMPLEX SHAPES AREA = A + B + C + D
AREA A = (TRIANGLE) B x H ÷ 2
AREA B = (TRAPEZOID) (B1 + B2) x H ÷ 2
AREA C = (RECTANGLE) B x H
AREA D = (SQUARE) B x H

12. AREA – COMPLEX SHAPES TOTAL AREA = A + B + C + D
AREA A = 4.5 x 2 ÷ 2 = 4.5 𝑚 2
AREA B = ( ) x 2 ÷ 2 = 3.5 𝑚 2
AREA C = 4.5 x 2 = 9 𝑚 2
AREA D = 2 x 2 = 4 𝑚 2
TOTAL AREA = = 21 𝑚 2