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28 November, 11:30

Find the missing base (b1) of the trapezoid. Dimensions are in CM.

Area = 135 CM ^2, Height = 10 CM, b2 = 18 cm

What is b1?

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Answers (1)
  1. 28 November, 14:45
    0
    b1 = 9 cm

    Step-by-step explanation:

    The formula for area of a trapezoid is

    A = 1/2 (b1+b2) * h

    We know Area = 135 CM ^2, Height = 10 CM, b2 = 18 cm

    Substituting these in

    135 = 1/2 (b1+18) * 10

    Multiply 1/2*10

    135 = 5 (b1+18)

    Divide both side by 5

    135/5 = 5/5 (b1+18)

    27 = b1+18

    Subtract 18 from each side

    27-18 = b1+18-18

    9 = b1
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