# Question: What Is The Sum Of The Sides Of A Triangle?

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

“SAS” is when we know two sides and the angle between them.

use The Law of Cosines to calculate the unknown side, then use The Law of Sines to find the smaller of the other two angles, and then use the three angles add to 180° to find the last angle..

## How do you find the length of the sides of a triangle?

Given angle and hypotenuse Apply the law of sines or trigonometry to find the right triangle side lengths: a = c * sin(α) or a = c * cos(β) b = c * sin(β) or b = c * cos(α)

## How do you find an angle of a triangle with 3 sides?

“SSS” is when we know three sides of the triangle, and want to find the missing angles….To solve an SSS triangle:use The Law of Cosines first to calculate one of the angles.then use The Law of Cosines again to find another angle.and finally use angles of a triangle add to 180° to find the last angle.

## What is the sum of the side lengths of a triangle?

Triangle Inequality Theorem. The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

## What is the sum of all 3 sides of a triangle?

The sum of three sides of a triangle is known as perimeter.

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

Just like the Law of Sines, the Law of Cosines works for any triangle, not just right triangles. In particular, the Law of Cosines can be used to find the length of the third side of a triangle when you know the length of two sides and the angle in between. To use the Law of Sines to find a third side: 1.

## How do you find the side of a triangle with an angle and a side?

In any right angled triangle, for any angle:The sine of the angle = the length of the opposite side. the length of the hypotenuse.The cosine of the angle = the length of the adjacent side. the length of the hypotenuse.The tangent of the angle = the length of the opposite side. the length of the adjacent side.

## Why is every triangle 180 degrees?

And our little drawing shows that the exterior angle in question is equal to the sum of the other two angles in the triangle. In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the angle in the bottom right corner to make a 1800 angle.

## What do the sides of a triangle add up to?

Since the three interior angles of a triangle add up to 180 degrees, in a right triangle, since one angle is always 90 degrees, the other two must always add up to 90 degrees (they are complementary). … The side opposite the right angle is called the hypotenuse.

## Do the sides of a triangle add up to 360?

The General RuleShapeSidesSum of Interior AnglesTriangle3180°Quadrilateral4360°Pentagon5540°Hexagon6720°6 more rows

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

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.