Question

Classify a triangle with the side lengths of 15, 36, and 39?

Answer 1

is it a right obtuse acute or cannot be formed?

Answer 2

are you familiar with some of the well known right-angle triangles?

Answer 3

e.g. the 3, 4, 5 triangle?

Answer 4

not a clue

Answer 5

It's a right triangle. 39^2 = 15^2 + 36^2

Answer 6

ok, well there are a set of fairly well known right angled triangles.
3x4x5 is one
5x12x13 is another
if you look at the sizes given to you, you will notice they are all a scaled up version of the 5x12x13 right-triangle

Answer 7

what do you mean by scaled?

Answer 8

15 = 3x5
36 = 3x12
39 = 3x13

Answer 9

you can often solve problems like this by spotting patterns like this and avoiding any calculations.

Answer 10

ahh ok i see now thanks!

Answer 11

yw