Classifying and Solving Angles/Sides of Triangles Review

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 isosceles triangle.

Back

An isosceles triangle is a triangle that has at least two sides of equal length and 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 angles are equal, each measuring 60 degrees.

Front

If angle R in triangle RST is five more than twice x, how can you express angle R mathematically?

Back

Angle R can be expressed as R = 2x + 5.

Front

In triangle PQR, if angle Q is 68 degrees and the triangle is isosceles, what can you say about the other angles?

Back

In an isosceles triangle, the angles opposite the equal sides are equal. Therefore, angle P must also be 68 degrees.

Front

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

Back

To find an unknown angle in a triangle, use the formula: Unknown angle = 180 - (sum of the other two angles).

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.

Front

If triangle TUV is isosceles and one angle is 34 degrees, what is the measure of the other two angles?

Back

The other two angles must each measure 73 degrees, since 180 - 34 = 146, and 146/2 = 73.

Front

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

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

If angle T in triangle RST is sixteen less than seven times x, how can you express angle T mathematically?

Back

Angle T can be expressed as T = 7x - 16.