Triangles

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Tags

CCSS.4.G.A.2

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length.

Tags

CCSS.4.G.A.2

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.

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 an obtuse triangle?

Back

A triangle with one angle greater than 90 degrees.

Tags

CCSS.4.G.A.2

Front

What is the sum of the angles in a triangle?

Back

180 degrees.

Tags

CCSS.8.G.A.5

Front

How can you determine if three lengths can form a triangle?

Back

The sum of the lengths of any two sides must be greater than the length of the third side.

Front

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

Back

It is an equilateral triangle.

Tags

CCSS.4.G.A.2

Front

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

Back

It is a right triangle.

Tags

CCSS.4.G.A.2

Front

What is the formula to find the missing angle in a triangle?

Back

Missing angle = 180° - (sum of the other two angles).

Tags

CCSS.8.G.A.5