Question

I have made a closed right circular cone whose length of the base radius is 15cm and slant
height is 24cm. Let us calculate the curved surface area and total surface area of that cone.
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Answer 1

Step-by-step explanation:

given,

r=15

l=24

so,the curved surface area of a cone is pie rl

Answer 2

Answer:

Given :-

Radius of base of the cone = 15 cm

Slant height = 24 cm

Find Out :-

Curved surface area

Total surface area

Solution :-

To find curved surface areas we know that,

▶ $Curved\: surface\: area\: =\: {\pi}rl$

By substituting the formula we get,

⇒ $\dfrac{22}{7} \times 15 \times 24$

⇒ $\dfrac{22}{7} \times 360$

➠ 1131.43 sq cm.

Hence, the curved surface area is 1131.43 sq cm.

Again, to find total surface area we know that,

▶ $Total\: surface\: area =\: {\pi}r(r + l)$

By substituting the formula we get,

➛ $\dfrac{22}{7} \times 15(15 + 24)$

➛ $\dfrac{22}{7} \times 15(39)$

➛ $\dfrac{22}{7} \times 585$

➦ 1838.57 sq cm.

Hence, the total surface area is 1838.57 sq cm.