Isosceles and Equilateral triangles practice

Front

What is an isosceles triangle?

Back

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

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three angles are 60°.

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

If two angles of a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

In an equilateral triangle, what is the measure of each angle?

Back

Each angle measures 60°.

Front

How do you find the height of an isosceles triangle?

Back

The height can be found using the Pythagorean theorem, splitting the triangle into two right triangles.

Front

What is the relationship between the sides and angles in an isosceles triangle?

Back

The angles opposite the equal sides are also equal.

Front

If the base of an isosceles triangle is 10 cm and the equal sides are 7 cm, can it exist?

Back

No, because the sum of the lengths of the two equal sides must be greater than the base.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

If the sides of an equilateral triangle are 6 cm, what is its perimeter?

Back

The perimeter is 6 cm + 6 cm + 6 cm = 18 cm.