Read each item carefully. Choose the letter of the correct answer.
3. The diameter of a circle is 10 cm, what is its area?
a. 78.05 cm2
b. 78.50 cm2
C. 75.80 cm2
d. 58.70 cm2
4. The radius of a circle is 4cm, what is the area of the circle.
a. 50.24 cm2
C. 54.20 cm2
b. 50.42 cm2
d. 20.50 cm2
5. A lawn sprinkler sprays water 10 feet in every direction as it rotates. What is the
area of the sprinkled lawn?
a. 314 sq. ft.
c. 31.4 sq. ft.
b. 3.12 sq. ft.
d. 78.50 sq.ft.
3. The diameter of a circle is 10 cm, what is its area?
a. 78.05 cm2
b. 78.50 cm2
C. 75.80 cm2
d. 58.70 cm2
4. The radius of a circle is 4cm, what is the area of the circle.
a. 50.24 cm2
C. 54.20 cm2
b. 50.42 cm2
d. 20.50 cm2
5. A lawn sprinkler sprays water 10 feet in every direction as it rotates. What is the
area of the sprinkled lawn?
a. 314 sq. ft.
c. 31.4 sq. ft.
b. 3.12 sq. ft.
d. 78.50 sq.ft.
Answers & Comments
Answer:
3. a. 78.05 cm²
4. a. 50.24 cm²
5. a. 314 sq. ft.
Solution:
#3
r = ½ / 10
r = 5 cm
A = πd²
A = (10 cm) (5 cm) (5 cm)
A = 78.05 cm²
#4
A = πr²
A = (3.14)(4 cm) (4 cm)
A = 50.24 cm²
#5
A = (3.14) (10 ft) (10 ft)
A = 314 sq. ft.
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Answer:
3. B. 78.50 cm²
4. A. 50.24 cm²
5. A. 314 sq. ft.