Isosceles and Equilateral triangles

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all angles measuring 60°.

Front

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

Back

180°.

Front

What is an acute triangle?

Back

A triangle where all three angles are less than 90°.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

What is the definition of equiangular triangle?

Back

A triangle where all three angles are equal.

Front

If two angles of a triangle are equal, what can be said about the sides opposite those angles?

Back

The sides opposite the equal angles are also equal.

Front

What is the relationship between the angles in an equilateral triangle?

Back

All angles are equal to 60°.

Front

How do you find the length of a side in an isosceles triangle given the base and the height?

Back

Use the Pythagorean theorem: a² = b² + h², where 'a' is the length of the equal sides, 'b' is half the base, and 'h' is the height.

Front

What is the formula for the area of an equilateral triangle?

Back

Area = (√3/4) * a², where 'a' is the length of a side.