How To Calculate The Height Of An Isosceles Triangle

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How to Calculate the Height of an Isosceles Triangle

What is an Isosceles Triangle?

An isosceles triangle is a type of triangle that has two equal sides, or legs, and two equal angles. The two angles are usually referred to as the base angles, and the third angle, which is not equal to the other two, is referred to as the vertex angle. Because of its two equal sides, an isosceles triangle is very easy to identify.

How to Calculate the Height of an Isosceles Triangle

The height of an isosceles triangle can be calculated by using the Pythagorean Theorem. The theorem states that the square of the length of the longest side of a triangle (which is called the hypotenuse) is equal to the sum of the squares of the lengths of the other two sides (which are called the legs).

To calculate the height of an isosceles triangle, we need to know the length of the hypotenuse and one of the legs. Once we have this information, we can calculate the length of the other leg by using the Pythagorean Theorem. Once we have the length of both legs, we can calculate the height of the triangle by using the formula below:

Height = (Length of Leg) x (sin of Vertex Angle)

Example

Let's take a look at an example. Suppose we have an isosceles triangle with a hypotenuse of 10 units and a base angle of 30 degrees. To calculate the height of the triangle, we first need to calculate the length of the other leg. To do this, we can use the Pythagorean Theorem:

a2 + b2 = c2

where a and b are the lengths of the legs, and c is the length of the hypotenuse. In this case, a and b are both 5 units (because they are equal), and c is 10 units. So, we get the following equation:

52 + 52 = 102

This equation simplifies to 25 = 100, which is true, so we know that the length of the other leg is 5 units. Now, we can use the formula for the height of an isosceles triangle:

Height = (Length of Leg) x (sin of Vertex Angle)

In this case, the length of the leg is 5 units, and the vertex angle is 30 degrees. So, the height of the triangle is:

Height = 5 x (sin 30)

The height of the triangle is 2.5 units.

Conclusion

As you can see, calculating the height of an isosceles triangle is a relatively simple process. All you need to know is the length of the hypotenuse and one of the legs, and you can use the Pythagorean Theorem to calculate the length of the other leg. Once you have the length of both legs, you can use the formula for the height of an isosceles triangle to calculate the height of the triangle.

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