Question

Diameter of base of a cone is 10.5cm and its slant height is 110cm.Find its curved surface area.

Answer 1

Answer: csa of a cone :- pi *r* l

where r=10.5/2=5.25cm

3.14*5.25*110=1813 (approx)

Step-by-step explanation:

Answer 2

$\Large\tt\pink{ \underline{Question:-}}$

Diameter of base of a cone is 10.5cm and its slant height is 110cm.Find its curved surface area.

$\Large\tt\pink{ \underline{Solution:-}}$

$\rm\underline\red{Diagram:-}$

$\setlength{\unitlength}{1.2mm}\begin{picture}(5,5)\thicklines\put(0,0){\qbezier(1,0)(12,3)(24,0)\qbezier(1,0)(-2,-1)(1,-2)\qbezier(24,0)(27,-1)(24,-2)\qbezier(1,-2)(12,-5)(24,-2)}\put(-0.5,-1){\line(1,2){13}}\put(25.5,-1){\line(-1,2){13}}\multiput(12.5,-1)(2,0){7}{\line(1,0){1}}\multiput(12.5,-1)(0,4){7}{\line(0,1){2}}\put(10,1.6){\sf{r=10.5/2\: cm}}\put(20,10){\sf{110\:cm}}\end{picture}$

$\rm\underline\green{Given:-}$

• Diameter of cone = 10.5 cm

• Slant height (l) = 110 cm

$\rm\underline\blue{To\:find:-}$

• Curved surface area of cone.

$\Large\rm\red{{CSA\:of\:cone={\pi}rl}}$

$\rm\underline\orange{By\:using\:formula:-}$

Diameter of cone = 10.5 cm

Radius of cone = $\sf\dfrac{10.5}{2}$cm

Slant height (l) = 110cm

Curved Surface Area of Cone = πrl

=${{ \sf\dfrac{22}{7}\times\dfrac{10.5}{2}\times{110}}}$

= ${{ \sf\dfrac{22}{7}\times\dfrac{105}{20}\times{110}}}$

= 11 × 15 × 11 cm²

= 1815 cm²

Therefore, Curved Surface Area of Cone = 1815cm².