Find the length of a ladder that is nine metres from a wall and reaches a height of 12cm. Please explain well .

Thank you

2. Originally Posted by frankpham12
Find the length of a ladder that is nine metres from a wall and reaches a height of 12cm. Please explain well .

Thank you
Draw a diagram. There's a right-triangle. Use Pythagoras' Theorem to solve for the length of the hypotenuse.

3. And be careful, your units should be the same. Recall that $1~\text{cm} = 10^{-2}~\text{m}$

4. Originally Posted by mr fantastic
Draw a diagram. There's a right-triangle. Use Pythagoras' Theorem to solve for the length of the hypotenuse.
thanks a lot