Can anyone please help me solve this problem? It has to do with finding angles.?

w00wee

New member
The question reads: suppose a 10 ft ladder is placed on the ground against a 5 ft wall, so as to exactly reach the top pf the wall. What angle does the ladder make with the ground.
The answer to this problem is 30 degrees but i have no idea on how to solve it. Can anyone please be nice enough to help me with this problem. Thank you in advance.
 
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