The lengths 3 cm, 4 cm, and 5 cm form a right-angled triangle.
The lengths 8 m, 10 m, and 15 m do not form a right-angled triangle.
The lengths 6 inches, 8 inches, and 10 inches form a right-angled triangle.
The lengths 5 cm, 12 cm, and 13 cm form a right-angled triangle.
So, three out of the four sets of lengths provided form right-angled triangles.
I see an audio box at the top left, not sure if this is relevent...
