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Question

If two angles of a triangle are 30° and 60°, third angle will be

A
30°
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B
60°
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C
40°
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D
90°
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Solution

The correct option is D 90°
According to the angle sum property of the triangles, the sum of all three angles should be equal to 180°.

The third angle = 180° - (30° + 60°)
= 90°

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