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Find the are of the circle below.

User Make Mark
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To find the area of the circle with diameter = 18 cm

We will use the formula:


\text{Area of a cirlce = }\pi r^2

where r= radius of the circle

From the quesion diameter = 18 cm

radius = diameter/2

radius = 18cm/2 = 9 cm

substituting r = 9cm into the formula


Area\text{ of a circle = }\pi(9)^2
A\text{rea of the circle }=\text{ 81}\pi cm^2

The above answer is when we are to leave the answer in terms of π

Otherwise if π is given to be 3.14 or 22/7 , we will simply substitute into the formula

That is given that π= 3.14


\text{Area of the circle = 81 }*3.14=254.34cm^2

User Mika Riekkinen
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