Question

using the side lengths, determone whether the triangle is acute, obtuse, or right

Answer 1

Let a=4,b=5,c=8

a^2+b^2<c^2
So, triangle is obtuse.

Answer 2

16+64+25=105

Answer 3

if your triangle was a right triangle with legs 4 and 5 its hypotenuse would be
c^2 = 4^2 + 5^2 = 16+25= 41
c= sqrt(41) , or about 6.4