Introduction to Triangles

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all three angles measuring 60°.

Front

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

Back

180°.

Front

What is a right triangle?

Back

A triangle that has one angle measuring 90°.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length and the angles opposite those sides are equal.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths and all angles of different measures.

Front

How do you find the perimeter of a triangle?

Back

Add the lengths of all three sides.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

What is an exterior angle of a triangle?

Back

An angle formed by one side of the triangle and the extension of an adjacent side.

Front

What is the relationship between an exterior angle and the two opposite interior angles?

Back

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

Front

What is a linear pair of angles?

Back

Two adjacent angles that form a straight line, summing to 180°.