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Angle Sum Property

The angle of ...

Question

The angle of a triangle are $(3 x + 25)^{o}, (5 x + 45)^{o}$ and $(12 x + 10)^{o}$ . Find the angles.

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Solution

$(3 x + 25^{\circ}) + (5 x + 45) + (12 x + 10) = 180$
$20 x + 80 = 180$
$20 x = 100$
$x = 5^{\circ}$
$\Rightarrow 40^{\circ}, 70^{\circ}, 70^{\circ}$

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