Triangle sides and angles

Front

What is the Triangle Inequality Theorem?

Back

The Triangle Inequality Theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

Can the sides 5, 8, and 4 form a triangle?

Back

Yes, because 5 + 4 > 8, 5 + 8 > 4, and 8 + 4 > 5.

Front

Can the sides 8, 2, and 8 form a triangle?

Back

Yes, because 8 + 2 > 8, 8 + 8 > 2, and 2 + 8 > 8.

Front

Can the sides 3, 6, and 2 form a triangle?

Back

No, because 3 + 2 is not greater than 6.

Front

Can the sides 10, 18, and 10 form a triangle?

Back

Yes, because 10 + 10 > 18, 10 + 18 > 10, and 18 + 10 > 10.

Front

Can the sides 7, 5, and 4 form a triangle?

Back

Yes, because 7 + 5 > 4, 7 + 4 > 5, and 5 + 4 > 7.

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle with all sides of different lengths.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle with at least two sides of equal length.

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle with all three sides of equal length.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.