You can use Pythagreos theorem to determine it! Pythagreos theorem is a^2 + b^2 = c^2 1) 4^2 + 4^2 = 6^2 16 + 16 = 36 32 = 36 (So this is not a right-angled triangle ) 2) 16^2 + 12^2 = 20^2 256 + 144 = 400 400 = 400 (Sp this is a right-ngled triangle)
