Question

THE SLANT HEIGT OF A CONE IS 15CM AND THE DIAMETER OF ITS BASE IS 3.44CM.WHAT ID THE TOTAL SURFACE AREA ?


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Answer 1

Step-by-step explanation:

Given : Diameter = 3.44

so , radius will be :

$radius = \frac{diameter}{2}$

$\frac{3.44}{2}$

$radius = 1.72$

Now total surface area of cone :

$\pi \: r(l + r)$

$\frac{22}{7} \times 1.72(15 + 1.72) \\ = \frac{22}{7} \times 1.72(16.72) \\ = \frac{22}{7} \times 28.7584 \\ = 3.14 \times 28.7584 \\ = 90.30(approx)$