The circumference of a circle is 15.9mm.
Find the length of the radius.
Give your answer rounded to 1 DP.

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R = 2.6 mm

Step-by-step explanation:

D = C ÷ π

D = 15.9 ÷ 3.14

D = 5.06

D = 5.1 mm

R = D ÷ 2

R = 5.1 ÷ 2

R = 2.55

R = 2.6 mm

r = 2.5 mm

Step-by-step explanation:

The circumference of a circle has the following formula.

circumference = 2πr

where

r = radius

π = 3.14

circumference = 15.9 mm

circumference = 2πr

15.9 = 2 × 3.14 × r

15.9 = 6.28 r

divide both sides by 6.28

r = 15.9/6.28

r = 2.53184713376

Rounding to 1 decimal place

r = 2.5 mm

(-5,-28)

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