Triangles

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices.

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

What do you call a triangle with all sides of different lengths?

Back

A scalene triangle.

Front

What do you call a triangle with at least two sides of equal length?

Back

An isosceles triangle.

Front

What do you call a triangle with all sides of equal length?

Back

An equilateral triangle.

Front

What is the Pythagorean theorem?

Back

In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.

Front

Can a triangle have angles measuring 90 degrees, 45 degrees, and 45 degrees?

Back

Yes, this is a right triangle.

Front

What is the triangle inequality theorem?

Back

The sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

If one angle of a triangle measures 60 degrees and another measures 80 degrees, what is the measure of the third angle?

Back

The third angle measures 40 degrees.

Front

What is an acute triangle?

Back

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