Properties of Triangles Flashcards

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

A triangle with all three sides equal in length and all angles equal to 60°.

A triangle with two sides of equal length and two angles of equal size.

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

A triangle with one angle equal to 90°.

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

The base angles of an isosceles triangle are always equal.

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

The area of a triangle is calculated as 1/2 × base × height.

In a right-angled triangle, a² + b² = c², where c is the hypotenuse.