Triangle angle sum theorem

Front

What is the Triangle Angle Sum Theorem?

Back

The Triangle Angle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Tags

CCSS.8.G.A.5

Front

If one angle of a triangle is 90 degrees, what can you say about the other two angles?

Back

The other two angles must sum to 90 degrees, making the triangle a right triangle.

Tags

CCSS.8.G.A.5

Front

What is the measure of the third angle if two angles of a triangle are 50 degrees and 60 degrees?

Back

The third angle measures 70 degrees (180 - 50 - 60 = 70).

Tags

CCSS.8.G.A.5

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Tags

CCSS.8.G.A.5

Front

If a triangle has angles measuring 45 degrees and 45 degrees, what is the measure of the third angle?

Back

The third angle measures 90 degrees (180 - 45 - 45 = 90).

Tags

CCSS.8.G.A.5

Front

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

Back

In an isosceles triangle, the angles opposite the equal sides are equal.

Tags

CCSS.HSG.CO.C.11

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Tags

CCSS.8.G.A.5

Front

If one angle of a triangle is 95 degrees, what can you conclude about the other two angles?

Back

The other two angles must be acute (less than 90 degrees) and their sum must be 85 degrees (180 - 95 = 85).

Tags

CCSS.8.G.A.5

Front

What is the formula to calculate the sum of angles in a triangle?

Back

The sum of angles in a triangle is calculated as: Angle1 + Angle2 + Angle3 = 180 degrees.

Tags

CCSS.8.G.A.5

Front

If a triangle has angles measuring 30 degrees and 60 degrees, what is the measure of the third angle?

Back

The third angle measures 90 degrees (180 - 30 - 60 = 90).

Tags

CCSS.8.G.A.5