answersLogoWhite

0


Best Answer
If two sides are given and you need to know the length of the third side use the Pythagrean Theorem formula. Then you find the square root.

c² = a² + b²

* * * * *

That is useful only if the triangle is a right angled triangle. Most are not. The correct answer depends on what information you do have.

User Avatar

Wiki User

12y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How do you find the unknown length of a triangle?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

The pythagorean theorem can what?

it can help you find the unknown length on one side of a triangle


How do you find the unknown length of one side of a triangle when you know the perimeter and the length of the other two sides?

subtract the two sides that you know from the perimeter to get the unknown side.


How do you find an unknown angle of a triangle without having a length of one of the sides using sohcahtoa?

If you have the length of two of the sides and one other angle you can use the law of sines.


A radius of a regular triangle is 12 Find the length of one side of the triangle?

A radius of a regular triangle is 12 . find the length of one side of the triangle?


How do you find the midsegment of a triangle?

A midsegment of a triangle is parallel to the side of the triangle, and it's length is half the length of that side


How do you find out the length of base of triangle?

The answer depends on what information you do have about the triangle.


HOW do you find the similar ratio of a triangle?

Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.


How do you find the perimeter of a right triangle when the length of one side is unknown?

You begin by finding the length of the unknown side. The square of the hypotenuse is equal to the sum of the squares of the two legs. Then once you have the lengths of all 3 sides, you adum all up, and you have the perimeter.


How do the properties of an isosceles triangle an equilateral triangle and a right triangle how you find the measure of unknown angles?

It works out as: 180 minus the 2 known angles = unknown angle


How do you find the perimeter of a scalene triangle?

-- Find the length of one side. -- Find the length of another side. -- Find the length of the remaining side. -- Add the three numbers. -- Their sum is the perimeter of the scalene triangle.


How do you use the Pythagorean theorem?

The Pythagorean states that a2 + b2 = c2 for a right triangle, where a and b are the lengths of the legs of the right triangle, and c is the length of the hypotenuse (the diagonal side).Say you are given a triangle with legs of lengths 3 and 4, and need to find the length of the hypotenuse. You can write the equation32 + 42 = c2, where c is the length of the hypotenuse.This gives25 = c2, and taking the square root of both sides of the equation gives5 = c, so the length of the hypotenuses in this case is 5.Another example:Say you have a right triangle where the length of one leg is 12 and the length of the hypotenuse is 13, and you need to find the length of the other leg. You can write the equationa2 + 122 = 132, where a is the length of the unknown leg.Solving:a2 + 144 = 169a2 = 25a = 5, so in this case, the length of the unknown leg is 5.


How do you find the length of a triangle when perimeter is given?

If the triangle is equilateral, you simply divide the perimeter by three to find the length of each side. If the triangle is not equilateral, you will need more information to determine the length of each side.