A-shaped ladder

An unfolded double ladder (A-shaped rung) is 10 m long. How high will it reach if the painter extends both parts of the ladder and ensures that the two parts of the ladder are 12 m apart on the ground?

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You need to know the following knowledge to solve this word math problem:

arithmetic

square root

planimetry

Pythagorean theorem
right triangle

Grade of the word problem

practice for 13 year olds
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