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I'm so stuck! Please help me...
What sort of lines? Do you mean complementary and supplementary angles, a triangle with two known sides or circle theorems?
Urrm... The first question is like three lines coming out from one point in the middle and 2 angles have been completed and the last one saids X and we need to find out the X.
And theres another question on triangle... i cant find exterior and interior of circles and triangles.
For the question with three lines, maybe the two given angles and X add up to 180° because they line on a straight line.
I suspect for the question with the triangle you will have to use the cosine rule.
I can't really help more than this, because your question descriptions are pretty vague.