All About Triangles

Front

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

Back

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

Tags

CCSS.4.G.A.2

Front

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

Back

1. Acute Triangle: All angles are less than 90º. 2. Right Triangle: One angle is exactly 90º. 3. Obtuse Triangle: One angle is greater than 90º.

Tags

CCSS.4.G.A.2

Front

What is the Triangle Inequality Theorem?

Back

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

Front

How do you find the measure of a missing angle in a triangle?

Back

The sum of the angles in a triangle is always 180º. To find a missing angle, subtract the sum of the known angles from 180º.

Tags

CCSS.8.G.A.5

Front

What is the largest angle in a triangle?

Back

The largest angle is opposite the longest side of the triangle.

Front

What is the relationship between the sides and angles of a triangle?

Back

In a triangle, larger angles are opposite longer sides, and smaller angles are opposite shorter sides.

Tags

CCSS.HSG.CO.C.10

Front

What is an equilateral triangle?

Back

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

Tags

CCSS.4.G.A.2

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides that are equal in length and the angles opposite those sides are equal.

Tags

CCSS.4.G.A.2

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle in which all three sides are of different lengths and all three angles are of different measures.

Tags

CCSS.4.G.A.2

Front

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

Back

Use the Triangle Inequality Theorem: For lengths a, b, and c, they can form a triangle if a + b > c, a + c > b, and b + c > a.