ANSWER: Radii lines
OB
OD
OF
are all radii not any others.
OH
Radius = 10 units
A = r2 r = 8 feet
A = 3.14 x 82 (8 x 8)
A = 3.14 x 64
A = 200.96 square feet
PROBLEMS IN AREA OF A CIRCLE
A = π r2
(1) Find the area of four circles whose radii are as follows:
a. 5 inches.
b. 7 feet.
c. 6 yards.
d. 4.5 inches.
(2) What is the area of a cross section of petroleum pipe whose radius is 3
inches?
(3) The diameter of a circulartop table is 2 feet; what is its area?
(4) In making the bottom of a cup, a tinsmith cuts out a circle 3 inches in
diameter from a square piece of tin whose side is 3 inches. What is the area of
the bottom of the cup? How much tin is wasted?
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