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Mathematics 8 Online
OpenStudy (anonymous):

Classify the triangle based on the side lengths 7, 15 and 21 A. right B. acute C. obtuse D. no triangle can be formed with given side lengths

OpenStudy (anonymous):

wouldnt be acute?

OpenStudy (anonymous):

yes sorry it should be like this 7x + 15x + 21x = 180 43x = 180 x = 4.186.... 7x = 29.3... 15x = 62.79.... 21x = 87.9.... all angles are less than 90 degrees so acute

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