Use "right-angled" em uma frase

1. Naturally, if the blow of a right-angled collision, for instance, were heavy enough to smash through the inner bulkhead of the bunker, why, there would be then nothing to do but for the stokers and trimmers and everybody in there to clear out of the stoke-room

2. Triangles, expression of the sides of right-angled, by integral numbers, D