No. If the angles are in the ratio 3:4:5, the sides will be in the ratio sin(3):sin(4):sin(5) - NOT in the ratio 3:4:5.
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'a' and 'b' must both be acute, complementary angles.
equilateral acute
A right triangle is a triangle in which one angle is equal to 90 degrees and the remaing two angles are acute(ie., less than 90 degree). so this triangle is a right angle triangle.
right triangle and the other angle would be 70 degrees. Hope I helped :)
A triangle with no right angle and sides of different lengths is a scalene triangle.