## How do you find the 3rd side of a triangle?

How to Determine the Length of the Third Side of a Triangle When

## How do you find the third side of a triangle using trigonometry?

SAS. This means we are given two sides and the included angle. For this type of triangle, we must use The Law of Cosines first to calculate the third side of the triangle; then we can use The Law of Sines to find one of the other two angles, and finally use Angles of a Triangle to find the last angle.

## How do you find the side of a triangle given two sides?

How do you find the side of a right triangle given two angles and hypotenuse? Answer: If you know two angles, then you can work out the third since all the angles sum to 180 degrees. If the sides are a, b and the hypotenuse is c (opposite angle A), and the angles are A, B and C, then Sin A = a/c, so a = cSin A.

## What are the formulas for triangles?

Right Triangle

Right Triangle | |
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A triangle with one right angle. C = A + B = Pi/2 radians = 90o c2 = a2 + b2 (Pythagorean Theorem) | |

P = a + b + c s = (a+b+c)/2 K = ab/2 ha = b hb = a hc = ab/c ma = sqrt(4b2+a2)/2 mb = sqrt(4a2+b2)/2 mc = c/2 |

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## How do you find the third side of a triangle if two sides are known?

How to Determine the Length of the Third Side of a Triangle When