Isosceles Triangle Angles

The video tutorial explains how to find the vertex angle of an isosceles triangle given a base angle of 70 degrees. It uses the isosceles triangle theorem, which states that angles opposite congruent sides are congruent. By knowing two angles are 70 degrees, the video demonstrates how to calculate the vertex angle using the angle sum property of triangles, resulting in a vertex angle of 40 degrees.

What is the vertex angle of the given isosceles triangle?

• X degrees

• 70 degrees

• 90 degrees

• 60 degrees

What is the measure of the base angles in the given triangle?

• 60 degrees

• 70 degrees

• X degrees

• 90 degrees

According to the isosceles triangle theorem, what can be said about the angles opposite the congruent sides?

• They are different.

• They are complementary.

• They are congruent.

• They are supplementary.

If one base angle of an isosceles triangle is 70 degrees, what is the measure of the other base angle?

• 60 degrees

• 70 degrees

• X degrees

• 90 degrees

What is the relationship between the base angles in an isosceles triangle?

• They are equal.

• They are different.

• They are complementary.

• They are supplementary.

In an isosceles triangle, if one angle is 70 degrees, what is the measure of the angle opposite the congruent side?

• 70 degrees

• 90 degrees

• X degrees

• 60 degrees

What is the sum of the angles in any triangle?

• 270 degrees

• 90 degrees

• 360 degrees

• 180 degrees

How do you calculate the vertex angle X in the given triangle?

• X = 70 + 70

• X = 70 - 70

• X = 180 - 70

• X = 180 - 140

What is the measure of the vertex angle X in the given triangle?

• 40 degrees

• 70 degrees

• 60 degrees

• 90 degrees

If the base angles of an isosceles triangle are 70 degrees each, what is the measure of the third angle?

• 40 degrees

• 70 degrees

• 90 degrees

• 60 degrees