Question

Find the area of the following circles= if radius=15mm use pi=3.14

Answer 1

706.5 mm²

Explanation:

The radius is 15 mm. Therefore, the area of circle is πr². Substitute r = 15:

`\displaystyle{A= \pi \cdot 15^2}\\\\\displaystyle{A=\pi \cdot 225}\\\\\displaystyle{A=225\pi}`

SInce π is given as 3.14 -- therefore:

`\displaystyle{A=225\cdot 3.14}\\\\\displaystyle{A=706.5 \ \: \text{mm}^2}`

Therefore, the area of circle with radius of 15 mm is 706.5 mm²