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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

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  • J
    Lv 6
    8 years ago
    Favorite Answer

    for 1

    inscribed angle = half of relative central angle

    a)<ABC = <AEC = 118/2 = 59°

    b)<ABC = 51° | <AEC = 2*51° = 102°

    -----------------------------------------------------

    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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