Step-by-step explanation:
the answer would be to deduct/minus that number from 180, the reason for this is because a triangles 3 angles add up to 180°, so if a triangle is labeled ABC and angle A is 70°, you would do 180 - 70(Angle A) which would give you 110°, meaning those other two angles would have to add up to 110, now if you have an equilateral triangle, the answer is really simple, 60° for each side.
