Ladder 10 meters long is staying against the wall so that its bottom edge is 6 meters away from the wall. What height reaches ladder?

Correct result:

h =  8 m

#### Solution:

$c=10 \ \text{m} \ \\ a=6 \ \text{m} \ \\ h=\sqrt{ c^2-a^2 }=\sqrt{ 10^2-6^2 }=8 \ \text{m}$

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