Question

find the total surface area of cone if it's slant height is 21 and diameter of its base is 24m. ( with solution)​

Answer 1

Step-by-step explanation:

given that

slant height(l) of the cone is =21

diameter=24

therefore, radius=24/2=12

total surface area of cone = πrl +πr*

π(12)(21) + π(12)*

since π=3.14

797.66 + 452.16

=1249.82cm2

keep smiling....

Answer 2

Solution :-

$slant \: height \: = 21m \\ diameter \: = 24 \: m \\ radius \: = \: 12 \: m \\ total \: surface \: \: area \: = \: \pi \times r \:(l \: + \: r)$

Hence , Put the value

• 22 / 7 × 12 ( 21 + 12 )
• 22 / 7 × 12 × 33
• 22 / 7 × 396
• 22 × 376 ÷ 7
• 8712 ÷ 7
• $1244.6 {m}^{2}$ ( Approx. )

Thanks

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