5.4 practice: isosceles & 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 and all three angles measure 60 degrees.

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

How do you find the measure of the third angle in a triangle?

Back

Subtract the sum of the two known angles from 180 degrees.

Front

What is the relationship between the sides and angles in a triangle?

Back

In a triangle, the larger the angle, the longer the opposite side.

Front

If one angle of an isosceles triangle measures 40 degrees, what are the measures of the other two angles?

Back

Each of the other two angles measures 70 degrees.

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

In an equilateral triangle, if one side measures 12 cm, what is the perimeter?

Back

The perimeter is 36 cm (12 cm + 12 cm + 12 cm).

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle measures 60 degrees.