Angles and segments in triangles review

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length and the angles opposite those sides are equal.

Front

What is the vertex angle in a triangle?

Back

The vertex angle is the angle formed by the two equal sides of an isosceles triangle.

Front

How do you find the value of x in an isosceles triangle with given side lengths?

Back

Set the lengths of the two equal sides equal to each other and solve for x.

Front

What is a median in a triangle?

Back

A median is a line segment that connects a vertex of the triangle to the midpoint of the opposite side.

Front

How do you identify a median in a triangle?

Back

A median can be identified by finding the segment that connects a vertex to the midpoint of the opposite side.

Front

What is the exterior angle theorem?

Back

The exterior angle theorem states that the measure of an exterior angle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

How do you use the exterior angle theorem to find unknown angles?

Back

Identify the exterior angle and the two non-adjacent interior angles, then set up the equation: exterior angle = interior angle 1 + interior angle 2.

Front

What does it mean for two lines to be parallel?

Back

Two lines are parallel if they are in the same plane and do not intersect, no matter how far they are extended.

Front

How can you determine if two segments are parallel in a triangle?

Back

Use the properties of angles formed by a transversal or the triangle's angle relationships to determine parallelism.

Front

What is the sum of the interior angles in a triangle?

Back

The sum of the interior angles in a triangle is always 180 degrees.