GCSE Maths Practice: surface-area

Question 9 of 10

This question calculates the curved surface area of a cone.

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\( \begin{array}{l}\text{Which formula gives the curved surface area of a cone?}\end{array} \)

Choose one option:

\( \pi rl \) \( \pi r^2 \) \( 2\pi r \) \( \pi r^2 + \pi rl \)

Identify radius and slant height; multiply by π for CSA.

Curved surface area (CSA) of a cone is calculated with CSA = π r l. The slant height l is critical. For a cone with radius r and slant height l, multiply π × r × l to find CSA. This formula applies to cones of all sizes and is essential for surface area problems. Practice visualizing cones and identifying slant height, radius, and apex. Real-life applications include conical structures, funnels, and roof designs.