1.

If the diameter of A is 12cm and the other side B is 7cm what is the ratio

Answer»

Step-by-step explanation:

GIVEN:

Height (h) of cylindrical part = height (h) of the conical part =7 cm

Diameter of the cylindrical part =12 cm

Therefore, Radius (r) of the cylindrical part =

2

12

=6 cm

So, Radius of the conical part =6 cm

Slant height (l) of conical part =

r

2

+h

2

cm

=

6

2

+7

2

=

36+49

=

85

≈9.22 cm.

The total SURFACE area of the remaining solid = CSA of the cylindrical part + CSA of the conical part + Base area of the circular part

=2πrh+πrl+πr

2

=2×

7

22

×6×7+

7

22

×6×9.22+

7

22

×6×6

=264+173.86+113.14

=551 cm

2



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