Integer triangles

The pythagorean triples are well known, but it is not the only noticeable triangles with integer sides.
For instance triangle with sides 4,5,6 has angle A double of angle B (proof).
Find all integral sides triangles with the same property A=2B and sides less than 20.
Solution    Details

n times angles

This can be generalized to angle A = n× B
Find the integer triangle with smallest sides and angle A = 5×B
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60░ angle

Find all triangles with integer sides less than 20 and a 60░ angle.
of course, (1,1,1), (2,2,2) ... (20,20,20) are solutions, but any unequal sides triangle ?
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