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Mathematics

Grade9

Easy

Question

Find the lateral area of the given figure.

$477.52 m^{2}$
$427.26 m^{2}$
$578.05 m^{2}$
$427.04 m^{2}$

hint Hint:

The Formula for lateral surface area of the cone is where l is the slant height and r is the radius of the circular base of the cone.

The correct answer is: $427.04 space straight m squared$

Given , the height of cone h = 15m and radius of base of cone r = 8 m. Use the formula for slant height
$text Slant height end text equals square root of h squared space plus space r squared space end root space equals square root of 15 squared plus 8 squared end root equals square root of 289 equals 17 U s e space t h e space l a t e r a l space a r e a space f o r m u l a comma space L a t e r a l space a r e a space equals space pi r l equals space 3.14 space x space 8 space x space 17 space equals space 427.04 space m squared$
Therefore, The lateral surface area of cone is $427.04 space straight m squared$ .

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