The total surface area of a cone of base radius r and slanted height

1.	The total surface area of a cone of base radius r and slanted height l is equal to __________
A.	rl + 2 r<sup>2</sup>
B.	2 rl + 2 r<sup>2</sup>
C.	rl + r<sup>2</sup>
D.	2 r<sup>2</sup>
Answer» D. 2 r<sup>2</sup>

Discussion

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The total surface area of a cone of base radius r and slanted height l is equal to __________