Question

area and perimeter of a circle with radius 3cm and the central angle is 120

Answer 1

Answer:

Hope it helps :)

Step-by-step explanation:

Value of pie can be 22/7 or 3.14

Perimeter of Circle = 2πr

$=2*\frac{22}{7}*3\\\\\\=\frac{132}{7}\\\\\\=18.85cm$

or

$= 2*3.14*3\\\\\\=18.84cm$

Area of Circle = πr²

$=\frac{22}{7}*(3)^2\\\\\\=\frac{22}{7}*9\\\\\\= \frac{198}{7}\\\\\\=28.28~cm^2$

Or

$=3.14*(3)^2\\\\\\=3.14*9\\\\\\=28.26~cm^2$