SOLUTIONS TO PROBLEMS
(1) a. A = π r2
b. A = π r2
= 3.14 (5 inches)2
= 3.14 x (7 feet)2
= 3.14 x 25 square inches
= 3.14 x 49 square feet
A = 78.5 square inches
A = 153.86 square feet
c. A = π r2
d. A = π r2
= 3.14 (6 yards)2
= 3.14 (4.5 inches)2
= 3.14 x 36 square yards
= 3.14 x 20.25 square inches
A = 113.04 square yards
A = 63.58 square inches
(2) A = π r2
= 3.14 (3 inches)2
= 3.14 x 9 square inches
A = 28.26 square inches
(3) A = π r2
D = 2 feet
= 3.14 (1 foot)2
r = 1 foot
= 3.14 x 1 square foot
A = 3.14 square feet
(4) (Circle)
A = π r2
D = 3 inches
(Area of tin square)
= 3.14 x 1.5 inches
r = 1.5 inches
A = L x W
= 3.14 x 2.25 sq inches
= 3 inches x 3 inches
A = 7.06 square inches
= 9 square inches
Area of Square = 9.00 square inches
Area of Circle = 7.06 square inches
Amount Wasted = 1.94 square inches
If you had difficulty with these problems, you should go to page 28.
If you were able to solve these problems without any mistakes, turn to page 31.
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