Answer:
Step-by-step explanation:
35^2 - 30^2 does not equal 15^2 , so first one is not a right angled triangle,.
39^2 - 36^2 = 15^2 so It is a right angled triangle.
29^2 - 20^2 does not equal 15^2, so it isn't a right angled triangle.
30^2 - 15^2 does not equal 5^2, so it isn't a right angled triangle either.
Only right angled triangle in the set of 4 is (15,36,39)
