Isabelle has three rectangles identical to the one shown below. She joins them all
together to make a new shape.
a) What is the smallest perimeter that Isabelle's new shape can have?
b) Isabelle is given an extra identical rectangle, so she now has four of them.
What is the smallest perimeter that a shape made from all of her rectangles can
have now?
Give your answers in centimetres (cm).
3 cm
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