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1.5.2 Sine and cosine rules

Card 1 of 20

In triangle ABCABCABC, which side is opposite angle AAA?

A

180∘180^\circ180∘.

B

The angle between the two known sides.

C

Rearranging the cosine rule for angle AAA gives

cos⁡A=b2+c2−a22bc. \boxed{\cos A=\frac{b^2+c^2-a^2}{2bc}.} cosA=2bcb2+c2−a2​.​
D

Side aaa.

Card 1 of 20

1.5.2 Sine and cosine rules Flashcards

  1. A Level
  2. /Maths
  3. /1.5.2 Sine and cosine rules

20 flashcards on OCR A Level Maths 1.5.2 Sine and cosine rules: the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3.

Flashcards