Question

Pls help me find the area of a circle with radius of 7mm. let π=22/7

Answer 1

154 mm²

Explanation:

Area of circle :

• A = πr²

Solving :

• A = 22/7 x (7)²
• A = 22/7 x 49
• A = 22 x 7
• A = 154 mm²

Answer 2

See below~

Here, it is given that the radius of a circle is 7 mm and we've to find it's area .

So,

Formula:

`\purple{\boxed{\sf{A = \pi r^2}}} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:[ \pi =(22)/(7)]`

Now ,

`\Longrightarrow \sf{A = \pi *r^2}`

`\: \: \: \: \: \: \: \: \: \: \: \:`

`\Longrightarrow \sf{A = (22)/(7) *7^2}`

`\: \: \: \: \: \: \: \: \: \: \: \:`

`\Longrightarrow \sf{A = (22)/(7) *49}`

`\: \: \: \: \: \: \: \: \: \: \: \:`

`\Longrightarrow \sf{A = (22)/( \cancel7) * \cancel{49}}`

`\: \: \: \: \: \: \: \: \: \: \: \:`

`\Longrightarrow \sf{A = 22 * 7}`

`\: \: \: \: \: \: \: \: \: \: \: \:`

`\Longrightarrow \sf{A = 154}`

Therefore , the area of a circle is 154 mm²