Question

how to find radius of outer boundary of circle???plese explain ​

Answer 1

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The outer boundary of a circle is called a circumference. The circumference of a circle is the distance around the outside of the circle. It is like the perimeter of other shapes like squares. You can think of it as the line that defines the shape. For shapes made of straight edges this line is called the perimeter but for circles this defining line is called the circumference.

The formula for finding circumference of a circle is $2 \times \pi \times r$

where $r$ is the radius of circle

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Answer 2

Answer:

x

Step-by-step explanation:

let outer radius be - X

inner radius be -Y

area of circle = outer radius - inner radius

so in this you can put the value of area of circle and the value of inner radius and can find outer radius.