Question

if the area of circle is 1386 mm²,what will be it's radius? ​

Answer 1

Answer:

radius of Circle is 21 mm

Step-by-step explanation:

Let the radius of Circle be x mm

so, area of Circle= πr^2

= 22/7 × x × x. mm^2

= 22/7x^2 mm^2

Given, area of Circle= 1386 mm^2

according to the question,

22/7x^2 = 1386

x^2 = 1386 × 7 / 22

x^2 = 63 × 7

x^2 = 441

x = √441

x = 21 mm

Hence, radius of Circle is 21 mm

Answer 2

Answer:

area = 1386

Step-by-step explanation:

formula is

π r ^