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# Trigonometry Question Help watch

1. Hello. I am stuck on this trig question.
The triangle ABC, shown in the diagram, is such that AB=5cm, AC=8cm,BC=10cm and angle BAC=Theta.
Show that Theta=97.9, correct to the nearest 0.1 degrees.
Any help would be appreciated
2. (Original post by WhiteTigerKURD)
Hello. I am stuck on this trig question.
The triangle ABC, shown in the diagram, is such that AB=5cm, AC=8cm,BC=10cm and angle BAC=Theta.
Show that Theta=97.9, correct to the nearest 0.1 degrees.
Any help would be appreciated
Remember this formula or did you forget?

3. (Original post by LelouchViRuge)
Remember this formula or did you forget?

Oh, I forgot about that. Thank you✌️✌
4. (Original post by WhiteTigerKURD)
Oh, I forgot about that. Thank you✌️✌
Are you doing Edexcel?

If so, you'll be given this in the formula booklet:

This can just be rearranged for

Remember this bra ^^

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