## Isosceles Triangle

### An isosceles triangle is a type of triangle that has two sides of equal length and two angles that are also equal

An isosceles triangle is a type of triangle that has two sides of equal length and two angles that are also equal. These equal sides are called the legs of the triangle, and the angle opposite the two equal sides is called the vertex angle. The other two angles, formed by the leg and the base of the triangle, are called base angles.

Some properties of an isosceles triangle include:

1. The base angles are congruent (equal) to each other.

2. The measure of the vertex angle is equal to the sum of the measures of the base angles.

3. The three interior angles of an isosceles triangle always add up to 180 degrees.

To solve problems involving isosceles triangles, you can use the following formulas:

1. Perimeter: The perimeter of an isosceles triangle can be found by adding the lengths of all three sides. Since two of the sides are equal, you can simplify the formula to: perimeter = 2 * side length + length of the base.

2. Area: The area of an isosceles triangle can be found by using the formula: area = (1/2) * base length * height. The height is a perpendicular line drawn from the base to the vertex angle.

3. Angles: If you know the measure of the vertex angle or the base angle, you can find the measures of the other angles. Since the base angles of an isosceles triangle are congruent, you can divide the total measure of the base angles by 2 to find the measure of each base angle. Similarly, if you know the measure of the vertex angle, you can subtract it from 180 degrees and then divide the result by 2 to find the measure of each base angle.

Overall, understanding the properties and formulas related to isosceles triangles can help you solve various problems involving their measurements and characteristics.

## More Answers:

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