Triangles and Quadrilaterals

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices. The sum of the interior angles of a triangle is always 180 degrees.

Front

What are the types of triangles based on angles?

Back

1. Acute Triangle: All angles are less than 90 degrees. 2. Right Triangle: One angle is exactly 90 degrees. 3. Obtuse Triangle: One angle is greater than 90 degrees.

Front

What are the types of triangles based on sides?

Back

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

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.

Front

If two angles of a triangle are 30 degrees and 70 degrees, what is the third angle?

Back

80 degrees.

Front

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

Back

180 degrees.

Front

What is an equilateral triangle?

Back

A triangle where all three sides and all three angles are equal, each angle measuring 60 degrees.

Front

What is a right triangle?

Back

A triangle that has one angle measuring exactly 90 degrees.

Front

What is a scalene triangle?

Back

A triangle where all three sides and all three angles are different.

Front

What is an isosceles triangle?

Back

A triangle that has at least two sides that are equal in length and the angles opposite those sides are equal.