The angle of elevation of a ladder leaning against a wall is 72°. If the ladder is 20 feet long, how far is the base of the ladder from the wall?
I got 19.02, is that right? (Pleeeeease be right ಠ෴ಠ)

Question

The angle of elevation of a ladder leaning against a wall is 72°. If the ladder is 20 feet long, how far is the base of the ladder from the wall? 
I got 19.02, is that right? (Pleeeeease be right ಠ෴ಠ)

anonymous · Answer

cos72 = x/20

20cos72 = x

20(0.309) = x

x = 6.18 ft

anonymous · Answer

$$20\text{ Cos}[72{}^{\circ}]=5 \left(-1+\sqrt{5}\right)=6.2 \text{ feet}$$

kymber · Answer

Waha. Thaanks