Question

Circumference & Area of Circles Practices

Answer 1

1. Find the circumference of a circle with a radius of 5 cm.
Circumference = 2πr
Circumference = 2 x π x 5
Circumference ≈ 31.42 cm

2. Find the area of a circle with a diameter of 10 inches.
Radius = diameter/2
Radius = 10/2
Radius = 5 inches

Area = πr^2
Area = π x 5^2
Area ≈ 78.54 square inches

3. Find the circumference of a circle with a diameter of 12 meters.
Radius = diameter/2
Radius = 12/2
Radius = 6 meters

Circumference = 2πr
Circumference = 2 x π x 6
Circumference ≈ 37.68 meters

4. Find the area of a circle with a radius of 8 cm.
Area = πr^2
Area = π x 8^2
Area ≈ 201.06 square cm

5. Find the circumference of a circle with an area of 100 square units.
Radius = √(Area/π)
Radius = √(100/π)
Radius ≈ 5.64 units

Circumference = 2πr
Circumference = 2 x π x 5.64
Circumference ≈ 35.46 units