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Cosine Rule: a2 = b2+c2-2bc*cos A is applicable to all triangles

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Q: Can The law of cosines can only be applied to right triangles?
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Related questions

Can The law of cosines can only be applied to acute triangles?

No, it applies to all triangles.


Can law of cosines can only be applied to acute triangles?

No, it applies to all triangles.


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.


What is the formula for the third side of a triangle?

a2+b2=c2, but that only works for right triangles, where c is opposite the right angle. The law of cosines, see Related Link below, will help for non right triangles, but you need to know one of the angles.


Can trigonometry be applied only in right angled triangles?

No. It can be used on any triangle.


Is it true that Pythagorean theorem can only be used for right-angled triangles?

Yes. The Pythagorean Theorem is true for only right triangles. However, a variety of other similar equations can be used for other triangle types. Law of Sines: a/sinA = b/sinB = c/sinC Law of Cosines: c2 = a2 + b2 - 2ab*cosC


Does Pythagorean Theorem apply to triangles?

Yes. But only right triangles.


Does pythagoras' theorem work for all triangles?

no only right triangles


Does the Pythagoream Theorem Work on all triangles?

No, only right triangles


Is The HL Congruence Postulate of Triangles only for right triangles?

yes


Do all triangles have right angles?

No. Only right triangles do, and not all triangles can be right triangles. Equilateral triangles, for example, are always 60°-60°-60°. Isosceles and scalene triangles can be right triangles; all isosceles triangles have the additional useful property of being able to be split into two right triangles.


Is the Pythagorean theorem is true for all similar triangles?

Only right triangles.