UPSKILL MATH PLUS

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1. Find the diameter of the sphere of surface area \(154\) \(m^2\).
 
Answer:
 
The diameter of the sphere \(=\)  \(m\)
 
 
2. The radius of a spherical balloon increases from \(12\) \(cm\) to \(16\) \(cm\) as air being pumped into it. Find the ratio of the surface area of the balloons in the two cases.
 
Answer:
 
The ratio of the surface area of the balloons is i:i.
 
 
3. If the base area of a hemispherical solid is \(1386\) sq. metres, then find its total surface area.
 
Answer:
 
Total surface area of the solid \(=\)  sq. metres
 
 
4. The slant height of a frustum of a cone is 5 \(cm\) and the radii of its ends are 4 \(cm\) and 1 \(cm\). Find its curved surface area.
 
Answer:
 
The curved surface area of a frustum of a cone \(=\)  \(cm^2\)
  
[Note: Enter the answer upto two decimal places.]