GEO 5.4 - Equilateral and Isosceles Triangles

Front

What are the properties of an equilateral triangle?

Back

All sides are of equal length and all angles measure 60°.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length and the angles opposite those sides are equal.

Front

How do you find the measure of an angle in an isosceles triangle?

Back

If two angles are equal, you can use the formula: 180° - (2 * angle) = third angle.

Front

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

Back

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

Front

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

Back

The angles opposite the equal sides are also equal.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

In an equilateral triangle, what is the relationship between the sides and angles?

Back

All sides are equal, and all angles are equal to 60°.

Front

How can you determine if a triangle is scalene?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

Front

What is the definition of a triangle?

Back

A polygon with three edges and three vertices.

Front

If the length of one side of an isosceles triangle is 10 cm, what could be the lengths of the other two sides?

Back

The other two sides must be equal and can be any length less than 20 cm (10 cm + 10 cm) to satisfy the triangle inequality.