Amel is asked to create triangles using three of four given sticks. The sticks measure 3 in., 6 in., 7 in., and 8 in. He creates these 4 triangles. Triangle 1: 3 in., 6 in., 7 in. Triangle 2: 3 in., 6 in., 8 in. Triangle 3: 3 in., 7 in., 8 in. Triangle 4: 6 in., 7 in., 8 in. How many of his triangles are obtuse?

Question

Israel Hobbs

7 January, 07:01

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Tatiana Mata · Answer 1

Only 1, 3,7,8 = 120 degrees using the law of cosines