# Geometry

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A triangle has side lengths of 18 cm, 80 cm, and 81 cm. Classify it as acute, obtuse, or right.

• Geometry -

for right-angled, is 81^2 = 80^2 + 18^2 ??

for obtuse angle, 81^2 > 80^2 + 18^2

notice two sides are almost equal, so it will look like an isosceles triangle

• Geometry -

the answer to this queston is acute! :)

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