Classifying triangles

Front

What are the three main types of triangles based on their sides?

Back

Equilateral, Isosceles, Scalene.

Tags

CCSS.4.G.A.2

Front

What are the three main types of triangles based on their angles?

Back

Acute, Right, Obtuse.

Tags

CCSS.4.G.A.2

Front

What is an equilateral triangle?

Back

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

Tags

CCSS.4.G.A.2

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.

Tags

CCSS.4.G.A.2

Front

What is a scalene triangle?

Back

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

Tags

CCSS.4.G.A.2

Front

What is an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Tags

CCSS.4.G.A.2

Front

What is a right triangle?

Back

A triangle that has one angle measuring exactly 90 degrees.

Tags

CCSS.4.G.A.2

Front

What is an obtuse triangle?

Back

A triangle where one angle is greater than 90 degrees.

Tags

CCSS.4.G.A.2

Front

How do you find the missing angle in a triangle?

Back

Use the fact that the sum of the angles in a triangle is always 180 degrees.

Tags

CCSS.8.G.A.5

Front

What is the formula for finding the missing angle if two angles are known?

Back

Missing angle = 180 - (angle1 + angle2).

Tags

CCSS.7.G.B.5