Answer:
D. √176 cm
Explanation:
Were given a right triangle.
PQ = 7 cm
QR = 15 cm
To find the length of side PR, apply Pythagorean theorem, which is c² = a² + b²
Where,
c = hypotenuse/longest side = 15 cm
a = PR
b = 7 cm
Thus:
15² = PR² + 7²
225 = PR² + 49
225 - 49 = PR²
176 = PR²
√176 = PR
PR = √176 cm