(Honors) Triangle Angle Sum, Ext Angle Thm, Isos & Equil Trian

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°.

Front

What is an exterior angle of a triangle?

Back

An exterior angle of a triangle is formed by one side of the triangle and the extension of an adjacent side. The measure of an exterior angle is equal to the sum of the measures of the two opposite interior angles.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length, which also means that the angles opposite those sides are equal.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three interior angles are equal, each measuring 60°.

Front

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

Back

To find the measure of a missing angle in a triangle, subtract the sum of the known angles from 180°.

Front

If two angles of a triangle are 40° and 50°, what is the measure of the third angle?

Back

The third angle measures 90° (180° - 40° - 50° = 90°).

Front

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

Back

In an isosceles triangle, the base angles are equal, and the vertex angle is determined by the measure of the base angles.

Front

How can you determine if a triangle is scalene?

Back

A triangle is scalene if all three sides are of different lengths, which also means that all three angles are of different measures.

Front

What is the formula for finding the area of a triangle?

Back

The area of a triangle can be found using the formula: Area = 1/2 * base * height.

Front

What is the significance of the base in an isosceles triangle?

Back

The base of an isosceles triangle is the side that is not equal in length to the other two sides, and it is often used to determine the height of the triangle.