Circumference and area of a circle
circumference and area of a circle, expressions with π, radius from the circumference, radius and diameter from the area, part of a circle and disc (half, a quarter, three quarters), wheel turns
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Problem
A bicycle wheel has diameter 74 cm. How many metres does the bike cover in 950 turns? Take π ≈ 3.14.
Problem
Find the area of a disc of radius 8 cm. Take π ≈ 3.14.
Problem
The area of a disc is 64π dm². How long is its radius?
Give the exact answer with π
The area of a disc is 169π dm². What is the circumference of the circle around this disc?
Choose the correct form
Which expression gives the area of a disc of radius 9?
Problem
Find the area of a disc of diameter 30 cm. Take π ≈ 3.14.
Problem
Find the area of three quarters of a disc of radius 16 cm. Take π ≈ 3.14.
Problem
A circle has circumference 37.68 cm. How many centimetres is its radius? Take π ≈ 3.14.
Problem
A circle has a circumference of 48π dm. How long is its diameter?
Problem
Find the length of a quarter of a circle of radius 11 cm. Take π ≈ 3.14.
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