Which change will quadruple the lateral surface area of a cone?
2 answers:
Answer:
D)Increase the height so that the slant height quadruples.
Step-by-step explanation:
Given that a cone undergoes changes in height or radius or slant height.
We have to find which change will quadruple the lateral surface area of cone.
Lateral surface area of cone =
Thus depends on radius and slant height
Let us check one by one options
A) When radius quadruples by increasing slant height we find lateral SA
will change more than quadruples because of change of slant height. Hence wrong.
B) When we quadruple the height 4 times, slant height will not be quadrupled exactly hence option is wrong.
C) If both radius and height are quadrupled then LSA will become 16 times the original hence false.
D) When we increase the height so that slant height quadruples, then radius will be the same, thus making LSA = 4 times the original
Option D is right.
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x is a number between 8 and 12 exclusive.
To find:
The value of x.
Solution:
It is given that x is a number between 8 and 12 exclusive. It means the value of x lies between 8 and 12 but 8 and 12 are not included.
The whole numbers for range are 9, 10, 11.
Therefore, the values of x are 9, 10, 11 and the value of x in the form of inequality is .