Question

Find the radius of a circle whose circumference is 26.4

Answer 1

$2\pi r = 26.4 \\\pi r \: = 13.2 \\ r = (13.2 \times 7) \div 22 \\ r = 4.2units$

Answer 2

Answer:

Circumference= 2πr

26.4= 2×22÷7×x (let r be x)

264÷10=44÷7×x

132÷5=44÷7×x

132×7÷44×5=x

4.2=x

So radius=4.2