Practice: Circumference & Area of Circles

Independent Practice Worksheet | Grade 7

Name: Date: Period:
Formulas:   C = pi x d   |   C = 2 x pi x r   |   A = pi x r squared   |   pi is approximately 3.14
Part A: Find the Circumference
1 Radius = 9 cm
C =
2 Diameter = 16 in
C =
3 Radius = 11 m
C =
4 Diameter = 25 ft
C =
Part B: Find the Area
5 Radius = 4 cm
A =
6 Radius = 10 in
A =
7 Diameter = 8 m (Find radius first!)
A =
8 Diameter = 14 ft (Find radius first!)
A =
Part C: Find Both Circumference AND Area
9 A circle has a radius of 6 inches. Find both the circumference and area.
Circumference =    Area =
10 A circle has a diameter of 22 cm. Find both the circumference and area.
Circumference =    Area =
Part D: Word Problems
11 A circular fountain has a diameter of 12 feet. How much tile trim is needed to go around the edge of the fountain? (Use 3.14 for pi)
Answer:
12 A circular pizza has a radius of 7 inches. What is the area of the pizza? (Use 3.14 for pi)
Answer:
13 A circular rug has an area of 50.24 square feet. What is the radius of the rug? (Use 3.14 for pi. Hint: Work backwards!)
Answer:
14 A bicycle wheel has a circumference of 75.36 inches. What is the diameter of the wheel? (Use 3.14 for pi)
Answer:
15 Maria wants to put a border around a circular garden with a radius of 5 meters. If the border material costs $3.50 per meter, how much will the border cost? (Use 3.14 for pi)
Answer:
16 A circular swimming pool has a diameter of 24 feet. The pool cover costs $2.00 per square foot. How much will it cost to cover the pool? (Use 3.14 for pi)
Answer:
Part E: Challenge Problems
17 A semicircle (half circle) has a diameter of 10 cm. Find the perimeter of the semicircle. (Include the straight edge!)
Answer:
18 Circle A has a radius of 3 inches. Circle B has a radius of 6 inches. How many times larger is the area of Circle B compared to Circle A?
Answer:
FAST Success Kit | Grade 7 | FL B.E.S.T. Standards: MA.7.GR.4.1, MA.7.GR.4.2