Question

http://prntscr.com/95khvq

Answer 1

If it is a right angle triangle then the sides meet the Pythagoras rule

a^2 + b^2 = c^2

C is always the longest side

so take the possible answers and find the longest side, and calculate the square of its lenght

then calculate the square of the OTHER 2 sides and add them together

If the sum is equal to the square of the longest side - then it is a right triangle - so that is your answer.

Only one of the options is a right angle triangle...