Question

The circumference of a circle is 21.98 cm. What is the diameter and area of the circle ?

Answer 1

Answer: We can easily solve this mathematical problem by using the following mathematical process.

Let, the radius of the semicircle = r cm

Circumference of the semicircle = πr cm

(3πr is the perimeter of a semicircle, not it's circumference)

According to the data mentioned in the question,

πr = 21.98

22/7 × r = 21.98

r = 21.98×7/22

r = 6.99

Diameter of the semicircle = 6.99×2 = 13.98 cm

Hence, the diameter of the semicircle is 13.98 cm

Explanation:

Answer 2

Answer:

Diameter is 7 cm

And area is 38.5 cm

Explanation:

Formula for circumference of circle is 2πr

Circumference = 21.98

2πr=21.98

2×22×r=21.98

7

r = 21.98×7

2×22

r= 3.5

Radius= 3.5 cm

Diameter=2r

=2×3.5

=7 cm

Area = πr square

= 22× 3.5×3.5

7

= 38.5 cm square

Hope it will help you

and sorry for late answer