Triangle Classification

A scalene triangle:

• A triangle with no equal sides or angles.

• A triangle with two equal sides and two equal angles.

• A triangle with three equal sides and three equal angles (60°).

Tags

CCSS.4.G.A.2

An Isosceles triangle:

• A triangle with no equal sides or angles.

• A triangle with two equal sides and two equal angles.

• A triangle with three equal sides and three equal angles (60°).

Tags

CCSS.2.G.A.1

An Equilateral triangle:

• A triangle with no equal sides or angles.

• A triangle with two equal sides and two equal angles.

• A triangle with three equal sides and three equal angles (60°).

Tags

CCSS.4.G.A.2

An acute angle is:

• Less than 90°.

• Greater than 90° but less than 180°

• Greater than 180° but less than 360°

• 90° exactly

Tags

CCSS.4.G.A.1

An obtuse angle is:

• Less than 90°.

• Greater than 90° but less than 180°

• Greater than 180° but less than 360°

• 90° exactly

Tags

CCSS.4.G.A.1

A right angle is:

• Less than 90°.

• Greater than 90° but less than 180°

• Greater than 180° but less than 360°

• 90° exactly

Tags

CCSS.4.G.A.1

Name this triangle:

• Right triangle

• Acute triangle

• Obtuse triangle

Tags

CCSS.4.G.A.2

Name this triangle:

• Right triangle

• Acute triangle

• Obtuse triangle

Tags

CCSS.4.G.A.2

Name this triangle:

• Right triangle

• Acute triangle

• Obtuse triangle

Tags

CCSS.4.G.A.2

Find the value of a for this triangle. (Remember: Internal angles of triangle add to 180°)

Tags

CCSS.8.G.A.5