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<D is complentary to <E and <D is supplementary to <G
If the measure of <E is 78
find the measure of <D and <G

  • Math -

    D+E=90 ... (1)
    D+G=180 ... (2)

    Given E=78,
    Solve for D from (1), and hence G from (2).

  • Math -

    <D=12
    <G=118

    ???

  • Math -

    Let's do a check:
    From (1)
    D+E=90 => 12+78=90 OK
    From (2)
    D+G=180 => 12+118=130 ≠ 180 ??

    Let's solve for G from (2):
    D+G=180
    12+G=180
    12-12+G = 180-12
    G=168

    Post if it's still not clear.

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