#5.1 Angles of Triangles

Front

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

Back

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

Front

Define an acute triangle.

Back

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

Front

Define a right triangle.

Back

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

Front

Define an obtuse triangle.

Back

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

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle where all three sides are of different lengths.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

What is the exterior angle theorem?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

If one angle of a triangle is 60 degrees and another is 70 degrees, what is the measure of the third angle?

Back

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

Front

How do you classify triangles based on their angles?

Back

Triangles can be classified as acute, right, or obtuse based on their angles.

Front

How do you classify triangles based on their sides?

Back

Triangles can be classified as scalene, isosceles, or equilateral based on their sides.