Ratio and proportion
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Ratio and proportion
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let the angles of the triangle are 2x, 3x & 4x
in a triangle sum of all the angles is 180°,
∴ 2x+3x+4x = 180°
9x = 180°
x = 180°/9
x = 20°
∴ first angle  = 2x = 2× 20° = 40°
second angle = 3x = 3× 20° = 60°
third angle   = 4x = 4×20° = 80°