The measures of the three angles of a triangle are in the ratio 3:4:5. What is the measure of the biggest angle?
Let the three angles of the triangle be $$3x , 4x , 5x$$
Sum of internal angles of a triangle = 180°
=> $$3x + 4x+5x = 180$$°
=> $$12x=180$$°
=> $$x=\frac{180}{12}=15$$°
$$\therefore$$ Biggest angle = $$5x=5\times 15=75$$°
=> Ans - (A)
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