Determine whether each set of side lengths represents an acute, obtuse, or right triangle.
2.8 ft, 14 ft, 16 ft
3. 9 in, 12 in, 15 in
4. 3.1 m, 5.9 m, 7.2 m

29.5977692753

step-by-step explanation:

the correct answer is a.) bc< mn 5 stars if this you : )

step-by-step explanation:

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.