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# C4 question help

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1. the first part of the 7(i) its asking to show that theta is equal to beta - alpha and I am struggling to understand how to do it. help!!
2. (Original post by chrisgul)

the first part of the 7(i) its asking to show that theta is equal to beta - alpha and I am struggling to understand how to do it. help!!
What do you know about angles in a triangle?

You know two of the angles in the triangle, what is the third angle in the triangle in terms of the other two?

What do you know about angles in a straight line?

Does that help?
3. theta+alpha+(180-beta)=180 (Angles in a triangle add up to 180 degrees)
so theta+alpha-beta=0
so theta=beta-alpha

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