Jamel is asked to create triangles using three or four given sticks. the sticks measure 3 in., 6in., 7in., and 8in. he creates these 4 triangles. how many are obtuse? 1 2 3 4

 He can make 3 obtuse triangle out of 4 triangles.

Step-by-step explanation:

Since, By the given numbers there can be made 4 triangles having sides:

1) 3, 6, 7

2) 6, 7, 8

3) 3, 7, 8

4) 3, 6, 8

And, for an obtuse triangle  the square of third side is always greater than the sum of two sides.

Therefore from the above four triangles only triangles 1), 3) and 4) follow the property of obtuse triangle. ( because, in triangle 1) , in 3) and in 4) .

Thus, triangles 1), 3) and 4) are obtuse triangles.

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