Since it is isosceles, 2 of the sides must be equal. They must also add to 18.

One foot is equal to 12 inches, so the perimeter 8 feet 6 inches is equal toinches.

An equilateral triangle has three sides of equal measure, so divide its perimeter by 3:

To convert 34 inches to feet and inches:

One side measures 2 feet 10 inches.

The perimeter of a shape is the length around the shape. In order to find the perimeter of a triangle, add the lengths of the sides:.

Because the lengths are in inches, the answer must be in inches as well.

等腰三角形有两个等边和结合起来d side that is unequal. If one given side is 5 and the other is 7, then the third missing side must equal either 5 or 7. If the missing side has length 5, then the perimeter is 17 (5+5+7). If the missing side is of length 7, then the perimeter is 19 (7+7+5). Of the two, only 19 is an answer choice, so the correct answer is 19.

If the perimeter ofQRSis 4 times the perimeter ofTUV,and the perimeter ofQRSis 36, then the perimeter ofTUVis equal to 36 divided by 4, which is 9. If the perimeter of equilateral triangleTUVis 9, then each individual side must have length 3.

Given that there are 12 inches in a foot, 36 inches is equal to 3 feet because 36 divided by 12 equals 3.

In an equilateral triangle, each side is equal. Thus, if one side is 3 feet long, that means that each of the other two sides are also 3 feet long.

Add the sides together to find the total perimeter.

The perimeter of the triangle is 9 feet.

Since the triangle is an isoscles, two of the sides must be equal. They must also add to. Looking at the possibilities, onlyhave two sides that are the same length. Now we need to check the triangle inequality to make sure the lengths create a triangle. The triangle inequality is:

Plugginginto these inequalities we get:

Therefore, the inequalities hold true thus,creates a triangle. Now we need to look at the sum of the lengths:

Therefore,is the correct answer.

The perimeter of any figure is the sum of the lengths of the sides:.

By the Pythagorean Theorem, ifandare the legs of a right triangle andis its hypotenuse, then

.

Setand solve for:

The perimeter of the triangle - the sum of the sidelengths - is

.

The perimeter is equal to the sum of the length of the sides. An equilateral triangle has three sides with equal lengths.