177 25 Marks

Rajesh is working out the area of a circle with radius 10.

He writes:

Area = 3.142 x 20

Explain why Rajesh’s working is wrong.

### Leave a Comment

You must be logged in to post a comment.

Rajesh is working out the area of a circle with radius 10.

He writes:

Area = 3.142 x 20

Explain why Rajesh’s working is wrong.

You must be logged in to post a comment.

Answer:Rajesh did πr2 (π × r × 2) instead of πr². The correct work would be

Area = 3.142 x 10² so… Area = 3.142 x 100 not 3.142 x 20.