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WAEC Mathematics 2025 Paper

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Question : 24

Total: 50

Find the total surface area of a solid circular cone with base radius 3 cm and slant height 4 cm. [Take π =

\frac{22}{7}

]

66 cm $^2$
37 $\frac{5}{7}$ cm $^2$
75 $\frac{3}{7}$ cm $^2$
78 $\frac{6}{7}$ cm $^2$

Solution:

Total surface area of cone = πrl + πr

^2

= πr(l + r) r = 3 and l = 4

Area =

\frac{22}{7}

× 3 (4 + 3) =

\frac{22}{7}

× 3 × 7 = 66 cm

^2

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