1) Estimate and measure the length of the longest visible wire in centimetres. Then round your answer to the nearest 5 cm. 2) The central circle (with the large yellow button) takes up space. Estimate its area by measuring its diameter and using the formula for area of a circle: A = π × r². 3) How many total mechanical components are there (e.g. gears, flasks, valves, dials, levers)? Make a tally and total count. 4) How many objects in the image show vertical symmetry? Name them and explain briefly. 5) If each coloured wire costs £0.45 per cm and you’ve measured a total of 95 cm of visible wire, how much would it cost to replace them all?

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