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 Example 7 Find the altitude of a right triangle with area 50 sq.ft. and base 8 ft. Solution: Area of a right triangle = 50 = \ altitude = 12.5 sq.ft. Example 8 Find the area of the trapezoid ABCD. Solution: Area of the trapezoid ABCD = = 12 cm2 Example 9 Find the circumference of a circle with area 25 p sq. ft. Solution: Area of the circle = p r2 = 25 p \ r = 5 ft. \ circumference = 2 pr = 10 p Example 10 Find the area of a circle with circumference 30p cm. Solution: Circumference = 2 p r = 30 p r = 15 cm area = p r2 = p ´ 152 = 225 p   ********** Index 4.1 Perimeter 4.2 Square 4.3 Rectangle 4.4 Parallelogram 4.5 Triangle 4.6 Trapezoids 4.7 Circles Chapter 5
Further Distribution Is Strictly Prohibited.

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