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Mathematics

Grade9

Easy

Question

Find the surface area.

$15 m^{2}$
$16 m^{2}$
$18 m^{2}$
$20 m^{2}$

hint Hint:

The surface area of Pyramid = $B space plus space 1 half space cross times space P l space$ where p is the perimeter of the base , B is area of the base and l is the slant height of the pyramid.

The correct answer is: $20 space straight m squared$

$text Given the side of the base is 2 and slant height l = 4 end text text The perimeter of the base = 4 x 2 = 8 end text text The area of the base is end text 2 squared equals 4 U s e space t h e space s u r f a c e space a r e a space f o r m u l a comma space S u r f a c e space a r e a space equals space B space plus space 1 half space cross times space P l S. A space equals space 4 space plus space 1 half space left parenthesis 8 right parenthesis left parenthesis 4 right parenthesis equals 20 space straight m squared$
Therefore, surface area of the given pyramid is 20 square meters.

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