Question

The radius of the base of a cone is 7 cm , and its slant height is 10 cm. The curved surface area is ;

A)220 sq.cm

B)110 sq.cm

C)440 sq.cm

D)145 sq.cm

E)none of these
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Answer 1

Answer:

A) 220 sq.cm

Step-by-step explanation:

CSA=πrl

CSA=(22/7)×7×10

CSA=22×10

CSA=220 sq.cm

Answer 2

Answer :

›»› The curved surface area of cone are 220 cm².

Given :

• The radius of the base of a cone is 7 cm , and its slant height is 10 cm.

To Find :

• The curved surface area of cone = ?

Solution :

As we know that

→ CSA of cone = πrl

→ CSA of cone = 22/7 * 7 * 10

→ CSA of cone = 22 * 1 * 10

→ CSA of cone = 22 * 10

→ CSA of cone = 220

║Hence, the Curved surface area of cone are 220 cm².║

Correct option is A)220 sq.cm ✔

Extra Brainly Knowledge :

⪼ Volume of cone = ⅓πr²h.

⪼ TSA of cone = πr(l + r).

⪼ Slant height of cone = √h² + r².

⪼ LSA of cone = πr(√h² + r²).

⪼ Surface area of cone = πr(r + √h² + r²).