Identify the type of triangle

What type of triangle is shown below?

​A.)  Equiangular
B.)  Right Isosceles
C.)  Acute Scalene
D.)  Obtuse Scalene

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Identify the measure of the third angle of the triangle.

Angles of a triangle add up to 180°.

180 - (110 + 28)   {subtracted given angles from 180° to determine missing angle}
=  180 - 138   {worked inside parentheses}
=  42   {subtracted}

Angles of triangle are 28°, 42°, and 110°

If no angles are congruent, then none of the sides are congruent.  If no sides are congruent, it is scalene.
If an angle is larger than 90°, it is an obtuse triangle.

D.)  Obtuse Scalene

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