1.

If the slant height of the friand 28cm respectively. What isheight of the frustum cone is 10 cm and perimeters of its circular base are 10 cmrespectively. What is the curved surface area of the frustum?​

Answer»

Answer:

Step-by-step explanation:

CURVED Surface area of a frustum of a cone =πl(r  

1

​  

+r  

2

​  

) where l is the slant height,

r  

1

​  

 and r  

1

​  

 are the RADII of the lower and upper ends of a frustum of a cone.

Circumference of the lower circular base =2π r  

1

​  

=18

⇒r  

1

​  

=  

π

9

​  

 cm

Circumference of the upper circular base =2π r  

2

​  

=6

⇒r  

2

​  

=  

π

6

​  

 cm  

GIVEN, curved Surface area of the frustum of a cone =π×l×(  

π

9

​  

+  

π

6

​  

)=180  

l=15 cm


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