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Objective: find the area of geometric figures and shaded regions. What area formulas must be memorized?

 The amount of 2-dimensional space an object takes up  Measured in “square units” cm 2, ft 2, in 2

7 in 10 in

5 cm 2 cm

9 cm 7 cm

8 cm 6 cm 70 °

18 ft 20 ft 6 ft

8in

30 ° 2in

Area of outside shape – Area of inside shape The circle below has a radius of 8, and the square has sides of length 5. Find the area of shaded region

12 cm 9 cm 108 cm 2

36 m The perimeter of the rectangle is 126 m. Find the area. 972 m 2

24 cm 30 cm 360 cm 2

5 ft 3 ft 7.5 ft 2

22 ft 18 ft 15ft 27 ft 5. The area of the obtuse triangle is 1765. The area of the obtuse triangle is 176 A = 165 ft 2

A = 11.13 m 2

A = 35.95 in 2

A = 17.78 cm 2

A = 22.4 ft 2

6 cm 10 cm 9 cm 72 cm 2

11 m 25 m 13 m 12 m A = 216 m 2

5 in A=25 ∏ or 78.5

7 cm A=12.25 ∏ or 38.5

Find the area of the shaded sector:

Find the area of the shaded sector

Find the area of the shaded region

42.06

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