Mathematics
A conical toy tent-house, 28 cm in radius and 21 cm in height, is made from a rectangular sheet of paper 22 cm wide. The smallest length of the paper sheet required is :
70 cm
105 cm
140 cm
280 cm
Mensuration
18 Likes
Answer
Since, conical toy is made from the rectangular sheet.
∴ Surface area of cone = Area of rectangular sheet.
Let smallest length of the paper sheet required be a cm.
∴ πrl = length × breadth
Hence, Option 3 is the correct option.
Answered By
4 Likes
Related Questions
The radius and height of a solid metallic cone are r cm each. The volume of the cone is :
The radius of the base of a solid cone is r cm and its height is h cm; its curved surface area is :
π × r ×
π × r ×
π × r × (h + r)
πr2(h + r)
For a cone, the ratio between the volume and area of its base is 11 : 6. The height of the cone is :
units
5.5 units
11 units
5 units
The radii of two solid cones are equal and their slant heights are in the ratio 7 : 4. The ratio between their curved surface areas is :
4 : 7
7 : 4
16 : 49
49 : 16