Question

find the Diameter of circle with the following circumference:
a) 31.4cm​

Answer 1

Answer:

1 cm

Step-by-step explanation:

Circumference of a circle = 2πr

⇒ 31.4 cm = 2πr        we know π = 22/7 = 31.4

⇒ 31.4 cm  = 2 x 31.4 x r

⇒31.4 / 2x 31.4 cm = r

⇒1/2 cm = r

diameter = 2x r

⇒d = 2 x 1/2 cm

⇒ diameter = 1 cm

Answer 2

Answer:-

Given:

• Circumference of circle = 31.4 cm

To Find:

• Diameter of circle

Solution:

Let the radius of circle be r cm

According to given conditions;

Circumference of circle = 31.4 cm

⇨ 2πr = 31.4 cm

⇨ πr = 31.4 ÷ 2 cm

⇨ r = 15.7 ÷ 3.14

⇨ r = 5cm

∴ Radius = 5cm

Diameter = 2r = 2×5 = 10cm

∴ Diameter of circle = 10cm