Question

Find the curve surface of area cone whose radious base is 7cm and solvent hieght is 9cm

Answer 1

Appropriate Question :

• Find the curved surface area of cone whose radius base is 7cm and slant height is 9cm

Answer :

• Curved surface area of cone is 198cm²

Given :

• Radius base is 7cm
• Slant height is 9cm

Solution :

Given,

• Radius(r) is 7cm
• Slant height (l) is 9cm

We know that

• Curved surface area of cone = πrl

Where ,

• r is radius base
• l is slant height

Finding the curved surface area of cone :

➞ Curved surface area of cone = πrl

➞ Curved surface area of cone = 22/7 × 7 × 9

➞ Curved surface area of cone = 22 × 9

➞ Curved surface area of cone = 198 cm²

Hence , Curved surface area of cone is 198cm²

More Explanation :

• Slant height of the cone = l =√(r² + h²)
• Volume of cone = ⅓ πr²h
• Total Surface area of cone = πr(l + r)
• Curved surface area of cone = πrl
• Cone is a 3D shape

Answer 2

Given :

• Radius base is 7cm.
• Slant height is 9cm.

Find :

• The curved surface area of cone.

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Solution :

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$\bigstar{\red{\sf{\underline{\:Using\:Formula:}}}}$

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• ${\underbrace{\textsf{\textbf{\purple{Curved\:Surface\:Area\:=\:πrl}}}}}$

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Now,

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$\:\:\:\:\:\:\:{\dashrightarrow\:{\sf{\dfrac{22}{7}}\:\times\:7\:\times\:9}}$

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$\:\:\:\:\:\:\:{\dashrightarrow\:{\sf{22\:\times\:9}}}$

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$\:\:\:\:\:\:\:{\dashrightarrow\:{\sf{198}}}$

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$\:\therefore\:{\underline{\sf{Hence,\:The \:curved \:surface \:area \:of \:cone\:is\:{\textsf{\textbf{198\:cm² }}}}}}.$

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