If two angles of a triangle are 30- 120- then the triangle will beRight angle triangleScalene triangleEquilateral triangleIsosceles triangle

The correct option is D Isosceles triangleLet the third angle be 'x' 30^∘+120^∘+x=180 ⇒ x=180^∘ 150^∘ ⇒ x=30^∘ Here, two angles are equal then it is an isoscel ...

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Byju's Answer

Standard VII

Mathematics

Classification of Triangles Based on Angles

If two angles...

Question

If two angles of a triangle are $30^{\circ}, 120^{\circ}$ , then the triangle will be

Right angle triangle

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Scalene triangle

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Equilateral triangle

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Isosceles triangle

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Solution

The correct option is D Isosceles triangle
Let the third angle be 'x'
$30^{\circ} + 120^{\circ} + x = 180 \Rightarrow x = 180^{\circ} - 150^{\circ} \Rightarrow x = 30^{\circ}$
Here, two angles are equal then it is an isosceles triangle.

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If two angles of a triangle are 30∘,120∘, then the triangle will be

The correct option is D Isosceles triangleLet the third angle be 'x' 30∘+120∘+x=180⇒x=180∘−150∘⇒x=30∘ Here, two angles are equal then it is an isosceles triangle.

If two angles of a triangle are $30^{\circ}, 120^{\circ}$ , then the triangle will be

The correct option is D Isosceles triangle
Let the third angle be 'x'
$30^{\circ} + 120^{\circ} + x = 180 \Rightarrow x = 180^{\circ} - 150^{\circ} \Rightarrow x = 30^{\circ}$
Here, two angles are equal then it is an isosceles triangle.