A ladder is placed against a wall at a distance of 10 m. It is inclined at an angle of 60° to the ground. The length of the ladder is?

15 m 20 m 17.32 m 5 m

20 m

length of the ladder = x m cos 60° = \(\frac{BC}{AC}\) ⇒ \(\frac{1}{2}\) = \(\frac{10}{AC}\) ⇒ AC = 20 m