# Math question sheet! Please help?

http://www.forfar.ca/uploads/6/3/1/4/6314928/blm_1...

I need someone to explain how to get the answers, because I don't get it at all.

### 1 Answer

Relevance

- JLv 67 years agoFavorite Answer
for 1

inscribed angle = half of relative central angle

a)<ABC = <AEC = 118/2 = 59°

b)<ABC = 51° | <AEC = 2*51° = 102°

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for 2

a) central angle <BDC = 180°

==> inscribed angle = 180/2 = 90° = <CBA

it is a right triangle then

BC² = 4²+3² = 25

BC = 5

b)same reasoning ==> <BCA = 90°

right triangle

13² = BC²+12²

BC = 5

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