Triangle Angle Sum, Remote/Exterior Angles, Isosceles Triangles

What is the Triangle Angle Sum Theorem?

• The sum of the three angles in a triangle is always 90 degrees.

• The sum of the three angles in a triangle is always 270 degrees.

• The sum of the three angles in a triangle is always 360 degrees.

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

If one angle of a triangle measures 60 degrees and another angle measures 40 degrees, what is the measure of the third angle?

• 80

• 100

• 90

• 120

What is the Exterior Angle Theorem?

• The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the measure of its adjacent interior angle.

• The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the measure of its opposite interior angle.

• The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.

• The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the difference between the measures of its two remote interior angles.

If the measure of an exterior angle of a triangle is 120 degrees and one of the remote interior angles measures 40 degrees, what is the measure of the third angle?

• 100

• 200

• 80

• 160

What is an isosceles triangle?

• A triangle with three equal sides.

• A triangle with two equal sides.

• A triangle with no equal sides.

• A triangle with one equal side.

If two sides of a triangle are congruent, what can you say about the angles opposite those sides?

• The angles opposite the congruent sides are acute.

• The angles opposite the congruent sides are obtuse.

• The angles opposite the congruent sides are right angles.

• The angles opposite the congruent sides are congruent.

What is the sum of the angles in an isosceles triangle?

• 90

• 270

• 360

• 180

If the base angles of an isosceles triangle each measure 50 degrees, what is the measure of the third angle?

• 60

• 70

• 80

• 90

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

• Equal

• Parallel

• Perpendicular

• Congruent

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

• 70

• 90

• 80

• 60