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, each measuring 60 degrees.

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

How do you find the length of a line segment between two points (x1, y1) and (x2, y2)?

Back

Use the distance formula: Length = √((x2 - x1)² + (y2 - y1)²).

Front

What is the formula to find the midpoint between two points (x1, y1) and (x2, y2)?

Back

Midpoint = ((x1 + x2)/2, (y1 + y2)/2).

Front

If angle 2 is 70 degrees in an isosceles triangle, what is the measure of the other equal angle?

Back

The other equal angle is also 70 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

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

Back

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

Front

How do you determine if a triangle is isosceles?

Back

A triangle is isosceles if at least two of its sides are of equal length.

Front

What is the relationship between the base angles of an isosceles triangle?

Back

The base angles of an isosceles triangle are equal.

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.