SOLUTION: 4. A triangle has sides that are 12 cm, 15 cm and 20 cm in lengths. Classify it as acute, obtuse or right or say there is insufficient information.

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Question 1114733: 4. A triangle has sides that are 12 cm, 15 cm and 20 cm in lengths. Classify it as acute, obtuse or right or say there is insufficient information.
Found 3 solutions by ikleyn, greenestamps, josgarithmetic:
Answer by ikleyn(52752)   (Show Source):
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Answer by greenestamps(13195)   (Show Source):
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If c is the longest side of a triangle and the other two sides are a and b, then

(1) if then the triangle is a right triangle;
(2) if then the triangle is obtuse;
(3) if then the triangle is acute.

For the given lengths,

so the triangle is obtuse.

Answer by josgarithmetic(39613)   (Show Source):
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12, 15, 20
3*4, 3*5, 5*4

Obtuse