Calculate the perimeter of the following shape correct to 1 decimal place. (2 marks)
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| \(\text{Perimeter}\) | \(=4\ \text{straight sides} +\dfrac{1}{4}\times \text{circumference}\) |
| \(=2\times 15+12+7.5+4.5 +\Bigg(\dfrac{1}{4}\times 2\pi\times 12\Bigg)\) | |
| \(=54+6\pi\) | |
| \(=72.849\dots\) | |
| \(=72.8\ \text{cm (1 d.p.)}\) |