Mean = sum(X)/n = 15cm/5 = 3cm
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1cm + 6cm, 2cm +5cm, 3cm + 4cm all the partners that add up to 7cm.
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It is impossible to answer this question because the question could refer to an object in 7-dimensional hyperspace or it could be an irregular heptagon (or other possible shapes in 3, 4 5 or 6 dimensions). In anything but 7-d space, its exact shape is indeterminate and so the area cannot be calculated. To understand the indeterminacy, a 2cm + 2cm + 2cm + 2cm shape could be a rhombus or a square, and these will have different areas. Without the angles, there is no way of knowing which.
463.2 grams.
24cm. cubed