Types of Triangles and Angle Degrees

Front

What is a scalene triangle?

Back

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

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle where all three sides are equal in length and all three angles are equal, each measuring 60°.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle with at least two sides of equal length and the angles opposite those sides are equal.

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-angled triangle?

Back

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

Front

What is an acute-angled triangle?

Back

An acute-angled triangle is a triangle where all three angles are less than 90°.

Front

If a triangle has angles of 30°, 60°, and 90°, what type of triangle is it?

Back

It is a right-angled triangle.

Front

If a triangle has angles of 45°, 45°, and 90°, what type of triangle is it?

Back

It is a right-angled triangle.

Front

If a triangle has sides of lengths 5 cm, 5 cm, and 8 cm, what type of triangle is it?

Back

It is an isosceles triangle.

Front

If a triangle has sides of lengths 7 cm, 8 cm, and 9 cm, what type of triangle is it?

Back

It is a scalene triangle.