Question

circumference of a circle is 10 cm find radius​

Answer 1

Step-by-step explanation:

Circumference of circle = 10 cm

therefore ,

$2\pi \: r = 10$

$2 \times 22 \div 7 \times r = 10$

$44 \div 7 \times r = 10$

$44 \times r = 10 \times 7$

$r = 70 \div 44$

$r = 1.59 \: cm$

Answer 2

Radius = 1.59 cm

Step-by-step explanation:

GIVEN

Circumference Of Circle = 10 cm

___________________________

TO FIND

Radius

___________________________

We know that,

Circumference Of Circle = 2 × π × r

10 = 2 × 22/7 × r

r = 10 × 7 / 2 × 22

r = 70 / 44

r = 1.59

Radius = 1.59 cm

___________________________

FORMULAS

Radius = Diameter / 2

Diameter = 2 × Radius

Circumference Of Circle = 2 × π × r

Area Of Semicircle = ½ × ( π × r² )

Perimeter Of Circle = 2 × π × r

Area Of Circle = π × r²

Perimeter Of Semicircle = ½ × ( π × d ) + d

or

Perimeter Of Semicircle = π × r + 2 × r