Classifying Triangles, Triangle Sum, Exterior Angle Theorem

Front

A scalene triangle has _____

Back

no congruent sides

Front

What is the measure of x if the angles are 42° and 2x + 12°?

Back

111°

Front

Classify the triangle with angles 60°, 60°, and 60°.

Back

Equiangular, Equilateral

Front

Set up an equation to find x if one angle is 42° and the other is 2 + 12x.

Back

42 + 8x = 2 + 12x

Front

Classify the triangle with angles 90°, 45°, and 45°.

Back

Right, Isosceles

Front

The sum of the interior angles of a triangle is _____ degrees.

Back

180 degrees

Front

The Exterior Angle Theorem states that the exterior angle is equal to the sum of the two _____ angles.

Back

opposite interior

Front

In an isosceles triangle, at least _____ sides are congruent.

Back

two

Front

An acute triangle has all angles measuring less than _____ degrees.

Back

90 degrees

Front

A triangle with one angle measuring more than 90° is called _____ .

Back

Obtuse