Question

two angles of a triangle are 70° and 40°. Is this triangle a scalene or isosceles triangle
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Answer 1

Isosceles Triangle

Let the third angle be x.

70° + 40° + x = 180° (Angle Sum Property)

110° + x = 180°

x = 180° – 110°

x = 70°

As two angles of the triangle are equal, the triangle is Isoceles.

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