Isosceles and Equilateral Triangles

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.

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 degrees.

Front

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

Back

The triangle is isosceles.

Front

In an isosceles triangle, what can be said about the angles opposite the equal sides?

Back

The angles opposite the equal sides are also equal.

Front

How do you find the height of an isosceles triangle?

Back

The height can be found by drawing a perpendicular line from the vertex opposite the base to the midpoint of the base.

Front

What is the formula for the area of a triangle?

Back

The area of a triangle is given by the formula: Area = 1/2 * base * height.

Front

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

Back

The perimeter of an equilateral triangle is 3 times the length of one side, so the perimeter is 18 cm.

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 60 degrees.

Front

How do you determine if a triangle is isosceles using side lengths?

Back

If two sides of a triangle are of equal length, then the triangle is isosceles.