5.1 Angles of Triangles

Front

What is the Triangle Sum Theorem?

Back

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

Front

What are the types of triangles based on side lengths?

Back

1. Equilateral: All sides are equal. 2. Isosceles: Two sides are equal. 3. Scalene: All sides are different.

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all three angles are less than 90°.

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle equal to 90°.

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle greater than 90°.

Front

What is an equiangular triangle?

Back

An equiangular triangle is a triangle where all three angles are equal, and each angle measures 60°.

Front

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

Back

Subtract the sum of the known angles from 180°.

Front

If one angle of a triangle is 50° and another is 60°, what is the measure of the third angle?

Back

The third angle is 70° (180° - 50° - 60° = 70°).

Front

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

Back

The sum of angles in a triangle = 180°.

Front

What is the relationship between the angles and sides of a triangle?

Back

In a triangle, the larger the angle, the longer the opposite side.