Types of Triangles

Front

What is a triangle?

Back

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

Tags

CCSS.2.G.A.1

Front

What are the types of triangles based on side lengths?

Back

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

Tags

CCSS.4.G.A.2

Front

What are the types of triangles based on angles?

Back

1. Acute: All angles are less than 90°. 2. Right-angled: One angle is exactly 90°. 3. Obtuse: One angle is greater than 90°.

Tags

CCSS.4.G.A.2

Front

What type of triangle has three equal angles?

Back

Equilateral triangle.

Tags

CCSS.4.G.A.2

Front

What type of triangle has two equal sides?

Back

Isosceles triangle.

Tags

CCSS.4.G.A.2

Front

What type of triangle has all sides of different lengths?

Back

Scalene triangle.

Tags

CCSS.4.G.A.2

Front

What is the sum of the angles in any triangle?

Back

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

Tags

CCSS.8.G.A.5

Front

If one angle of a triangle is 90°, what type of triangle is it?

Back

Right-angled triangle.

Tags

CCSS.4.G.A.2

Front

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

Back

Equilateral triangle.

Tags

CCSS.4.G.A.2

Front

If a triangle has angles of 70°, 60°, and 50°, what type is it?

Back

Acute triangle.

Tags

CCSS.4.G.A.2