Question

PTG has side lengths of 12 cm, 25 cm, and 19 cm. Which type of triangle is PTG?

right

acute

obtuse

isosceles

Answer 1

for isosceles 2 sides are the same.
for a right triangle a^2+b^2=c^2 where a and b are the legs and c is the hypotenuse.
so that's two things to check...

Answer 2

once you've done that it's easy to know what kind of triangle it is.

Answer 3

use cos rule to find the angles