High School Math : How to find the perimeter of a 45/45/90 right isosceles triangle
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Example Question #4 : 45/45/90 Right Isosceles Triangles
The hypotenuse of an isosceles right triangle has a measure of 
Not enough information to solve
In order to calculate the triangle's perimeter, we need to find the lengths of its legs. An isosceles triangle is a special triangle due to the values of its angles. These triangles are referred to as 
Now we can calculate the perimeter by doubling 
Example Question #3 : 45/45/90 Right Isosceles Triangles
The side lengths of an isoceles right triangle measure 
Not enough information to solve
An isosceles triangle is a special triangle due to the values of its angles. These triangles are referred to as 
Now we can calculate the perimeter by doubling 
Example Question #2 : 45/45/90 Right Isosceles Triangles
A triangle has two angles equal to 
When a triangle has two angles equal to 
The pattern for the sides of a 
Since two sides are equal to 
Add them all together to get 
Example Question #1 : Isosceles Triangles
An isosceles triangle has a base of 6 and a height of 4. What is the perimeter of the triangle?
None of these
An isosceles triangle is basically two right triangles stuck together. The isosceles triangle has a base of 6, which means that from the midpoint of the base to one of the angles, the length is 3. Now, you have a right triangle with a base of 3 and a height of 4. The hypotenuse of this right triangle, which is one of the two congruent sides of the isosceles triangle, is 5 units long (according to the Pythagorean Theorem).
The total perimeter will be the length of the base (6) plus the length of the hypotenuse of each right triangle (5).
5 + 5 + 6 = 16
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