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Is this statement true or falseYou can use the Law of Cosines to solve a triangle when you are given the lengths of the three sides and no angle measures?
monique robles
true
monique robles
Eve Ryan
Coty Bernier
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How do you calculate the angles of a triangle knowing the sides?
Law of cosines
Who discovered the law of cosines?
A caveman from 10,000 BCal-Kashi was the 1st to provide an explicit statement of the law of cosines in a form suitable for triangulation
What does the law of cosines reduce to when dealing with a right triangle?
D. The Pythagorean Theorem
What is the vector triangle?
The "vector triangle" illustrates the "dot product" of two vectors, represented as sides of a triangle and the enclosed angle. This can be calculated using the law of cosines. (see link)
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 figure out the area of a triangle when you only know the sides?
Use the law of cosines (look them up on wikipedia).
When would you use the law of sines or law of cosines instead of a trigonometric ratio?
Trigonometric ratios, by themselves, can only be used for right angled triangles. The law of cosines or the sine law can be used for any triangle.
How do you find a side of a triangle?
If it's a right triangle, use pythagorean's theorem (a2+b2=c2) to solve it. = If it's an oblique triangle, use the law of sines or cosines (see related link)
Can you use the Law of Cosines to solve a triangle when you are given two side lengths and the included angle measure?
Yes, absolutely
Altitude of right triangle with only one side known?
Law of sines or cosines SinA/a=SinB/b=SinC/c
How do you find a length of a triangle when you have an angle sandwiched between to sides?
It's impossible if you don't have any side measures. If you have a right triangle, and angle, and a side, you can use any of the trig functions to find the side. SOH CAH TOA. If you have two sides an an angle sides you can use the law of cosines, which is a2 = (b)2(c)2-2(b)(c)cos(A), or the law of sines, which is sin(A)/a = sin(B)/b The lower cased letters in the equation represent side measures of the corresponding angle measures, which are the upper cased letters.
What situation would you be FORCED to use law of cosines as opposed to law of sines?
When none of the angles are known, and using Pythagoras, the triangle is known not to be right angled.
