When do you use the sine rule instead of SOHCAHTOA?

When the triangle has no right angle, and you know a side and the angle opposite it plus one more measurement.

Is the sine rule on Foundation?

No. It is Higher content. Foundation right-angled trigonometry does not need it.

What is the sine rule formula?

a/sin A = b/sin B = c/sin C, where each side is opposite the angle with the same letter.

Sine rule GCSE Maths questions — non-right-angled triangles

Sine rule GCSE Maths questionsSine rule GCSE Maths questions for non-right-angled triangles: a/sin A = b/sin B, including the ambiguous case warning. Higher marked practice from the bank.Start free GCSE Maths test · Pricing