Equilateral and Isosceles Triangles Review

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 missing angle in a triangle?

Back

To find the missing angle in a triangle, use the fact that the sum of all angles in a triangle is 180 degrees. Subtract the sum of the known angles from 180.

Front

If two angles of a triangle are equal, what type of triangle is it?

Back

If two angles of a triangle are equal, it is an isosceles triangle.

Front

What is the formula for the area of a triangle?

Back

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

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 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 Pythagorean theorem?

Back

The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse (c) is equal to the sum of the squares of the lengths of the other two sides (a and b): c² = a² + b².

Front

What is the value of x if the angles of a triangle are 70 degrees and 40 degrees?

Back

x = 70 degrees + 40 degrees = 110 degrees; therefore, the missing angle x = 180 - 110 = 70 degrees.

Front

In an isosceles triangle, if one angle is 40 degrees, what are the other two angles?

Back

The other two angles are each 70 degrees, since the sum of angles in a triangle is 180 degrees.