Question

A triangle has side lengths of 18 cm, 80 cm and 81cm, Classify it as acute, obtuse, or right

Answer 1

Do you know the Pythagorean theorem?
If it's a right triangle, it must make the Pythagorean formula true.
\(a^2 + b^2 = c^2\)
Try it.

Answer 2

First I'd recommend drawing in relatively close to scale

Answer 3

it didn't work

Answer 4

\(18^2 + 80^2 = 81^2\)

\(324 + 6400 = 6724 = 82^2\)

\(18^2 + 80^2 = 82^2\)

Answer 5

With sides 18 and 80, 81 does not make a right triangle, but a third side of 82 would.

Answer 6

so its acute?

Answer 7

Correct.

Answer 8

ok thanks I think I got it now