Triangles - Isosceles & Equilateral

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 equal to 60°.

Front

How do you find the height of an isosceles triangle?

Back

The height can be found using the formula: height = √(a² - (b/2)²), where 'a' is the length of the equal sides and 'b' is the base.

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

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

Back

In an equilateral triangle, all sides are equal, and all angles are equal to 60°.

Front

How do you calculate the area of an isosceles triangle?

Back

Area = (base * height) / 2.

Front

What is the Pythagorean theorem?

Back

In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides (a² + b² = c²).

Front

What is the formula for the perimeter of an isosceles triangle?

Back

Perimeter = 2a + b, where 'a' is the length of the equal sides and 'b' is the base.

Front

What is the base angle of an isosceles triangle?

Back

The base angles are the angles opposite the equal sides of the triangle.