If two angles of a triangle are $40 °$ and $80 °$ , then the third angle is

$90 °$

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$80 °$

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$60 °$

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$45 °$

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Solution

The correct option is C
$60 °$

By the angle sum property of a triangle we know that sum of the all angles of a triangle is $180 °$ .
Sum of the two angles = $80 ° + 40 ° = 120 °$
So the third angle= $180 ° - 120 ° = 60 °$

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Two angles of a triangle are $60^{o}$ and $40^{o}$ . Find its third angle.

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