maths help

Please could you answer my question

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  1. Sure, you have to ask the question first though

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  2. CDEF is a trapezium
    ABCF is a rectangle and perimeter is20cm
    BD=9cm
    AB=6cm
    EF=3cm
    What is the area of CDEF

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  3. Okay so we know the perimeter is 20cm, that means using the rectangle formula for perimeter

    Perimeter =2(Length +Width)

    Substitute the numbers we have

    20cm=2(6cm+Width)
    20cm=12cm+2Width
    4=Width (after rearranging it)

    So we have found the answer for BC which is 4cm which makes CD 5 cm

    At this point you use the Trapezium area formula

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