A 11​-ft ladder is leaning against a wall and the wall is perpendicular to the ground. The base of the ladder is 7 ft from the wall. How high above the ground is the top of the​ ladder? The ladder reaches ft up the wall. ​(Simplify your answer. Type an exact​ answer, using radicals as​ needed.)

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A 11​-ft ladder is leaning against a wall and the wall is perpendicular to the ground. The base of the ladder is 7 ft from the wall. How high above the ground is the top of the​ ladder?
The ladder reaches ft up the wall.
​(Simplify your answer. Type an exact​ answer, using radicals as​ needed.)

 

The answer to this question was 6√2. I'm confused on how  they got that answer. 

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