Classifying Triangles

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle in which all three sides are of different lengths and all three angles are of different measures.

Front

What is 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°.

Front

What is a right-angled triangle?

Back

A right-angled triangle is a triangle that has one angle measuring 90°.

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle measuring more than 90°.

Front

What is an acute triangle?

Back

An acute triangle is a triangle in which all three angles are less than 90°.

Front

How can you identify a scalene triangle by its sides?

Back

A scalene triangle can be identified by the fact that all three sides are of different lengths.

Front

How can you identify an isosceles triangle by its angles?

Back

An isosceles triangle can be identified by having two equal angles, which are opposite the two equal sides.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180°.

Front

If a triangle has two equal sides and one angle greater than 90°, what type of triangle is it?

Back

It is an obtuse isosceles triangle.