Question

A triangle has two sides that measure 2.5 cm and 16.5 cm. Which could be the measure of the third side? A. 5.5 cm B. 12.5 cm C. 14 cm D. 17 cm

Answer 1

(2.5)^2 + (16.5)^2 = c^2
c = sqrt(2.5^2 + 16.5^2)
c = sqrt(278.5)
c = 16.69
Rounded up it would be 17, so the answer is D.