GCSE Maths Practice: perimeter-and-area

Question 9 of 10

Perimeter versus area units practice.

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\( \begin{array}{l}\text{Which of the following could represent a perimeter?}\end{array} \)

Select all correct options:

\( 24\,\text{cm} \) \( 36\,\text{m} \) \( 18\,\text{cm}^2 \) \( 50\,\text{mm} \)

Perimeter → linear units, area → square units.

Perimeter measures length around a shape, using units like cm, m, mm. Area uses square units (cm², m²). Recognizing the correct units is critical in exams. Practice identifying appropriate units in different problems, for rectangles, squares, and polygons. Always check that units match the quantity measured. For example, a rectangle 6 cm × 4 cm: perimeter = 20 cm, area = 24 cm². This distinction helps in geometry and practical applications.