Question

find the area of a circle whose radius is 7cm

Answer 1

Answer:

area of circle=πr^2

=22/7×7×7.

=154cm^2

Step-by-step explanation:

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Answer 2

$\huge\bold{\underline{\underline{{Given:}}}}$

• Radius (r) = 7cm

$\huge\bold{\underline{\underline{{To\:Find:}}}}$

• Area of the Circle.

$\huge\bold{\underline{\underline{{Solution:}}}}$

⚽${\boxed{\rm{\red{Area\:of\:Circle= \pi r^{2}}}}}$

Using This Formulae,

Area of the Circle = $\displaystyle{\sf{ \pi (7)^{2}cm}}$

:$\implies$ $\displaystyle{\sf{ \frac{22}{7} × 7cm × 7cm}}$

:$\implies$ $\displaystyle{\sf{ \frac{22}{ \cancel{7}} × \cancel{7cm} × 7cm}}$

:$\implies$ $\displaystyle{\sf{ 22×7cm^{2}}}$

:$\implies$ ${\underline{\sf{\pink{ 308cm^{2}}}}}$

Hence, The Area of the Circle is 308cm²

$\huge\bold{\underline{\underline{{Additionally:}}}}$

➤ What is an Area?

➛ The space occupied by the surface or the size of the surface is known as Area.

$\rule{400}1$

➤ What is a Perimeter?

➛ The length of the boundary of the surface is known as Perimeter.

$\rule{400}2$

• Area of a Circle = πr² ( r = Radius)
• Area of a Square = a² ( a = side )
• Area of a rectangle = l × b ( l = length , b = breadth.)
• Area of a Triangle = 1/2× b× h ( b= base , h = height.)

$\rule{400}2$

• Perimeter of a Circle = 2πr
• Perimeter of a square = 4a
• Perimeter of a rectangle = 2(l+b)
• Perimeter of a triangle = sum of all sides.

$\rule{400}4$