Need help now!!!!!!

Question

A training track is formed by joining a rectangle and two semicircles. The rectangle is 96m long  and 71m wide. What is the length of a training track running around the field?

Answer 1

Well the training track will have two straight parts (the length of the rectangle), and two semi circular parts (circle radius 71/2 because 71 is the width of the rectangle).

A circle has circumference 2πr where r is the radius and π=3.14 (can also assume 22/7).

So a semi circle has length half the circumference = πr

So the track length will be 96 + 96 + πr + πr (where r= 71/2 = 35.5, and π=3.14).

That works out as : 414.9 m. (training tracks are usually approx 400m so this makes sense).