Question

If the wheel of a car makes four complete rotation and half a turn, then find the number of straight angles through which it turned.

Answer 1

Each complete rotation of the wheel = 360${}^{\circ }$.
There are 2 straight angles in 360${}^{\circ }$.
Hence 4 complete rotation will have 4 $\times$ 2 = 8 straight angles.
Half a turn = 180 ° i.e 1 straight angle.
Hence the total number of straight angles through which the car wheel turned = 8 + 1 = 9