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Class 10 > Learn Mathematics > SURFCE AREA OF CONE
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SURFCE AREA OF CONE

Ramakrishna Dhooli
19/12/2018 0 0

SURFACE AREA OF CONE                                                           Cone  Cone

If, r=radis of the cone

     l= slant height

Then,

1)Curved Surface Area of the cone= πrl

2)Total surface Area of cone= πr(r+l)

Ex-  If,r=28 cm, l=30cm, then

1)Curved Surface Area of the cone= πrl

                                               =22/7x28x30

                                                =22x4x30 

                                                =2640    square cm

2)Total surface Area of cone= πr(r+l)

                                           =22/7x28(28+30)

                                            = 22x4(58)

                                             =5104 square cm

 

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