Your classmate is unsure about how to use a side lengths to determine the type of triangle . how would you explain this to your classmate ?

1) The side lengths of the triangles determine which of these types the triangle is:

a) equilateral if all the sides are equal

b) isoscels if two sides are equal and one is different

c) scalene is the three sides are different.

2) The side lengths determine the angles. When you know the three sides you can use the cosine law to determine the angles. The type of triangle according to the angles is:

a) acute if all the angles are less than 90°

b) right if one angle measures 90°

c) obtuse if one angle is greater than 90°

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