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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

 

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[next page]

Index

4.1 Perimeter
4.2 Square
4.3 Rectangle
4.4 Parallelogram
4.5 Triangle
4.6 Trapezoids
4.7 Circles

Chapter 5

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