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You have to use Pythagorean theory, which is a^2 + b^2 = c^2. So a is the base of the triangle, b is the leg of the triangle, and c is the hypotenuse. (This only works for a a triangle with a 90 degree angle)

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Q: How do you calculate the third side of a triangle?
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If you have a right angle triangle and one side equals 3 and one side equals 5 how do you calculate the lenght of the third side?

Using Pythagoras' theorem the third side works out as 4 units in length.


How do you use pythagaoras theorem?

If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.If you know any two sides of a right triangle, you can calculate the third by Pythagoras' Theorem.


How do you calculate the perimeter of a triangle?

-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.


What is the length of the third side of an equilateral triangle have?

The length of the third side of an equilateral triangle is the same as the lengths of both of the other two sides.


If one side of a triangle is 11 and the other side is 5 what is the minimum length of the third side?

The minimum third side length of a triangle having one side of 11 and another side of 5 is 6.


If one side of a triangle is 3 feet and the other is 2 feet what is the third side?

The length of the third side of this triangle must be greater than 1 foot and less than 5 feet, and the third side would be either 2 feet or 3 feet if it were an isosceles triangle.


What is the length of the third side in 6.0 and 8.0?

If the third side is the hypotenuse of a right triangle, it is 10.0


If two sides of the triangle is 6 and 5 what is the perimeter of triangle?

To find the perimeter of a triangle, you need to add the lengths of all three sides. If two sides of the triangle are 6 and 5 units long, you still need to know the length of the third side to find the perimeter. Without the length of the third side, it is not possible to calculate the perimeter of the triangle.


If you have the width and height of a triangle how do you get the third length?

Really you don't have enough data to calculate this.The height is not necessarily one of the three sides. The height is perpendicular to the width.If the triangle has a right angle, and you know two of the sides, you can calculate the third side using the rule of Pythagoras (a squared + b squared = c squared).Really you don't have enough data to calculate this.The height is not necessarily one of the three sides. The height is perpendicular to the width.If the triangle has a right angle, and you know two of the sides, you can calculate the third side using the rule of Pythagoras (a squared + b squared = c squared).Really you don't have enough data to calculate this.The height is not necessarily one of the three sides. The height is perpendicular to the width.If the triangle has a right angle, and you know two of the sides, you can calculate the third side using the rule of Pythagoras (a squared + b squared = c squared).Really you don't have enough data to calculate this.The height is not necessarily one of the three sides. The height is perpendicular to the width.If the triangle has a right angle, and you know two of the sides, you can calculate the third side using the rule of Pythagoras (a squared + b squared = c squared).


Calculate side of triangle?

The method depends on the information that you have.


What triangle has 15in each and the third side measures 10in?

An isosceles triangle.


If the sides of an isosceles triangle are 5 and 8 what is the third side?

The third side would be either 5 or 8,as an isosceles triangle has 2 equal sides.