# maths help

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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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