Question

Find the area of the shaded region in each figure, if the radius of the bigger circle is 9 cm and the smaller circle is 4 cm. Are the areas of the shaded region same in all the figures? ООО​

Answer 1

Answer:

yes they are same please mark me as brainliest

Answer 2

Answer:

circle is the set of all points in a plane at a given distance (called the radius ) from a given point (called the center.)

A line segment connecting two points on the circle and going through the center is called a diameter of the circle.

Circle showing radius and diameter

Clearly, if d represents the length of a diameter and r represents the length of a radius, then d=2r .

The circumference C of a circle is the distance around the outside. For any circle, this length is related to the radius r by the equation

C=2πr

where π (pronounced " pi ") is an irrational constant approximately equal to 3.14 .

The area of a circle is given the formula

A=πr2 .

Example 1:

What is the area of a circular table with diameter 6 ft?

Given that, the diameter of the circular table is 6 ft.

So, the radius of the circular table is half of the diameter. That is, radius is 3 ft.

Use the formula for area of a circle, A=πr2 , where r is the radius of the circle.

Substitute 3 for r in the formula.

A=π(3)2     =π(9)     ≈28.26

Therefore, the area of the circular table is about 28.26 ft2

Step-by-step explanation:

Please do it by yourself