# Trigonometry Help!

• Sep 30th 2009, 06:03 PM
June78
Trigonometry Help!
Could someone please explain to me how to do this question? I just what to understand what to do.The question confuses me for some reason so I don't know how to begin...... Thank-you
• Oct 1st 2009, 12:19 AM
Hello June78

Welcome to Math Help Forum!
Quote:

Originally Posted by June78
Could someone please explain to me how to do this question? I just what to understand what to do.The question confuses me for some reason so I don't know how to begin...... Thank-you

We are asked to start to record the height of the stone as soon as it becomes stuck. So at \$\displaystyle 0^o\$, the height is \$\displaystyle 0\$ cm - the stone is still at ground level.

After \$\displaystyle \tfrac14\$ revolution \$\displaystyle (90^o)\$, the stone will be level with the centre of the wheel, so it will be \$\displaystyle 30\$ cm above the ground.

Continue in the same way. At \$\displaystyle 180^o\$ it will be at the top of the wheel, so it's ...? cm above the ground.

When you come to sketch the graph, you'll need to consider 2 complete revolutions of the wheel. You'll get a graph similar to the ones here.