Volume and Surface Area

Q1:

What is the height of a circular cone?

I. The area of that cone is equal to the area of a rectangle whose length is 33 cm.

II. The area of the base of that cone is 154 sq. cm.

A I alone sufficient while II alone not sufficient to answer

B II alone sufficient while I alone not sufficient to answer

C Either I or II alone sufficient to answer

D Both I and II are not sufficient to answer

E Both I and II are necessary to answer

ANS:D - Both I and II are not sufficient to answer

II gives the value of r. But, in I, the breadth of rectangle is not given. So, we cannot find the surface area of the cone. Hence, the height of the cone cannot be determined. Correct answer is (D).

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