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How do you find the third side of a triangle when two sides are known?
Wiki User
∙ 12y ago
Use Pythagoras' theorem or trigonometry depending on what type of triangle it is.
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Only if it is a right triangle you will be able to use Pythagoras' theorem. This formula states that
a^2 + b^2 = c^2
Where a and b are your two of the sides and c is the hypotenuse of the triangle. f you know the hypotenuse but not one of the other sides you can manipulate this formula.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoIf the triangle is a right triangle, then you can use the Pythagorean Theory, a2+b2=c2, where side c is the hypotenuse.
If the triangle does not have any right angles, then you can apply trigonometric concepts.
To find the side opposite the given angle, take the cosine (cos button on your calculator) of the length of the adjacent side divided by the length of the hypotenuse.
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How Pythagorean theorem is used?
If two sides of a triangle with a right angle are known, the Pythagorean Theorem can help you find the third one. It can also be used to verify whether a certain triangle is, indeed, a right triangle (if the three sides are known).
How do you find values for the third side of a triangle?
Perimeter -2 known sides = 3rd side 180 -2 known angles = 3rd angle
How do you find the third side of a triangle when two sides and angle are known?
Depends on the Triangle. Right triangles with a 90 degree angle: http://en.wikipedia.org/wiki/Pythagorean_theorem
When do you use the Law of Cosines?
We use the law of Cosines to be able to find : 1. The measure of the third side, when the measure of two sides and the included angle of a triangle ABC are known. 2. The measure of any angle, when the measure of the three sides of a triangle ABC are known.
How do you use sine cosine and tangent?
They are used to find the angle or side measurement of a right triangle. For example, if 2 sides of a right triangle have known values and an angle has a known measurement, you can find the third side by using sine, cosine or tangent.
A triangle has a perimeter of 42in the lengths of two sides of the triangle are 13in and 16in find the length of the third side?
13 in
When and how to use the Pythagorean theorem?
Definition:Pythagorean theorem (also known as Pythagoras' theorem) is a mathematical statement about the relation among the three sides of a right triangle (right-angled triangle).It states:"In a right angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides."In any right-angled triangle, if the sides forming the right-angle are known as a and b and the hypotenuse as c, then the relation among the three sides of a right triangle is given by this equation: a2 + b2 = c2.When to use it:If the length of two sides of a right angled triangle are already known, you can find the unknown length of the third side.How to use it:As you know the relation among the three sides of a right triangle is represented by the equation a2 + b2 = c2 , substitute the known values in the equation and find out the length of the third side by solving the equation.See the related link.
How do you find the angle of triangle if all 3 sides is known?
Use trigonometry
What is given two sides and the included angle?
The cosine rule which is: a2 = b2+c2-2*b*c*cosine A This is used to find the third side of a triangle when the two other sides are known along with the angle between them. Used when the triangle is not a right angle.
How do you find the sides of the triangle?
a triangle always has three sides
How do you find the lengths of the sides of a triangle where one angle equals 90 degrees?
If you know the lengths of two sides then use Pythagoras' theorem to find the third side.
How do you solve to find a right triangle of you are given three sides?
Square the two smaller sides and add them together. Take the square root of the answer. If that is the same as the third side then you have a right angled triangle and if not, then you have not.
