Question

find the area of a circle whose diameter is 4.2 cm​

Answer 1

Answer:

area of a circle whose diameter is 4.2cm is 13.85cm

Answer 2

Step-by-step explanation:

Let the radius of the circle be r.

The value of π is 22/7 or 3.14. [Value of π is taken as 22/7 in this question]

Area of a circle = 2πr

The diameter of the circle=4.2

Therefore, radius of the circle = (4.2/2)cm

= 2.1 cm

Hence, area of the circle = {(2×22×2.1)/7} cm

= {92.4/7} cm

= 13.2 cm

Therefore,the area of a circle is 13.2 cm.

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