with the question reversed - given the area, what could the shape look like?
students will hopefully seek suitable base and height dimensions
(possibly forgetting that in a triangle the area involves halving)
some questions have two solutions
this can create opportunities to discuss why e.g. triangles with the same base and between two parallels have the same area
these could involve finding areas by dissecting a rectangle
the bottom left two can be justified visually
or you could involve surds
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