How tall is the tree?

​Albert is looking up at a tree. He is 25 feet from the base of the tree. The line of sight to the top of the tree is 27 feet.

The tree is approximately how tall?

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A right triangle is created with a leg of 25 feet (distance from tree), hypotenuse of 27 (line of sight),
and an unknown leg.

Pythagorean Theorem is a² + b² = c²
a and b are the legs, and c is the hypotenuse
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25² + b² = 27²  {substituted into Pythagorean Theorem}
625 + b² = 729  {evaluated exponents}
b² = 104  {subtracted 625 from each side}
b ≈ 10.2  {took square root of each side}

Disregarding Albert's height, because it was not stated,
the height of the tree is approximately 10.2 feet.

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