Question

UL 2012)
capacity of we glass.
4. The radii of the circular ends of a solid frustum
of a cone are 18 cm and 12 cm and its height is
8 cm. Find its total surface area. (Use a = 3.14)
(CBSE 2011)
​

Answer 1

Answer:

Answer: 2411.52 cm²

Step-by-step explanation:

We have , Height = 8 cm

Base radii , R= 18 cm and r = 12 cm

Also, the slant height

l = √(R -r)² + h²

= √(18-12 )² + 8²

= √ 6² +8²

= √36 + 64

= √100

= 10 cm

Now ,

Total surface area of the solid frustum

π(R+r)l +πR² +πr²

= 3.14 × ( 18 + 12 ) ×10 + 3.14 ×18²+ 3.14 ×12²

= 3.14 × ( 300 + 324 + 144 )

3.14 × 768

= 2411.52 cm²

So the total surface area of the frustum is 2411.52 cm²

Answer 2

Answer:

total surface area of frustum is = 2411.52

Step-by-step explanation:

thanks for the answer mate mark and FØŁŁØW me