Equilateral and Isosceles Triangles Practice

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, measuring 60 degrees each.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length and the angles opposite those sides are equal.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is always 180 degrees.

Front

If two angles in an isosceles triangle are 45 degrees, what is the measure of the third angle?

Back

The third angle measures 90 degrees.

Front

What do the angles in an equilateral triangle measure?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

In an isosceles triangle, if the equal sides are 10 cm each and the base is 8 cm, what is the height?

Back

The height can be found using the Pythagorean theorem, which gives approximately 7.21 cm.

Front

What is the vertex angle in an isosceles triangle?

Back

The vertex angle is the angle opposite the base, which is the angle formed by the two equal sides.

Front

If the base angles of an isosceles triangle are each 70 degrees, what is the vertex angle?

Back

The vertex angle measures 40 degrees.

Front

How do you find the area of a triangle?

Back

The area of a triangle can be found using the formula: Area = 1/2 * base * height.

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; conversely, the smaller the angle, the shorter the opposite side.