Isosceles and Equilateral Triangles

Front

What are the properties of an equilateral triangle?

Back

All sides are of equal length, and all angles are equal to 60°.

Front

How can you classify a triangle based on its angles?

Back

Triangles can be classified as acute (all angles < 90°), right (one angle = 90°), or obtuse (one angle > 90°).

Front

What is the definition of an isosceles triangle?

Back

An isosceles triangle has at least two 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°.

Front

What are complementary angles?

Back

Complementary angles are two angles that add up to 90°.

Front

What is the definition of a scalene triangle?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

Front

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

Back

Subtract the sum of the known angles from 180°.

Front

What is an equiangular triangle?

Back

An equiangular triangle is a triangle where all angles are equal.

Front

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

Back

In a triangle, the largest angle is opposite the longest side, and the smallest angle is opposite the shortest side.

Front

How can you determine if a triangle is isosceles?

Back

If at least two sides are of equal length, the triangle is classified as isosceles.