An isosceles right triangle has
30 degree angles in its
interior.
b. false
a. true

False, an iso triangle has 2 equal sides like an icecream cone but are not limited to 30 degrees all the time.

The answer is B. False.

An isosceles Right Triangle has one side 90°, and two equal sides 45°. Remember,  the angles have to add up to 180°, otherwise it isn't even a triangle. Overall, one unequal side, two equal sides.