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Mensuration and Trigonometry
Quick questions on Perimeter and area of plane figures explained: N(A)-Level Mathematics Mensuration and Trigonometry
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is perimeter?Show answer
Perimeter is the total length around the edge of a shape, found by adding all the side lengths. For a rectangle of length and width , the perimeter is . Perimeter is a length, so its unit is cm, m and so on.
What are area of straight-sided figures?Show answer
Area measures the space enclosed, in square units (cm, m). The key formulae are:
What are composite figures?Show answer
A composite figure is made from simpler shapes. To find its area, either add the areas of the parts, or take a whole shape and subtract the area of any pieces removed. Sketching the split clearly is the key step.
What are wrong units?Show answer
Perimeter is in cm, area in cm. Stating the wrong unit costs a mark.
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