If S denotes the area of the curved surface of a right circular cone of height h and semivertical angle a then S equals

If S denotes the area of the curved surface of a right circular cone o

1.	If S denotes the area of the curved surface of a right circular cone of height h and semivertical angle a then S equals
A.	h tan
B.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> h tan </td></tr><tr><td style="text-align: center;">3</td></tr></table>
C.	h sec tan
D.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> h sec tan </td></tr><tr><td style="text-align: center;">3</td></tr></table>
Answer» D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2"> h sec tan </td></tr><tr><td style="text-align: center;">3</td></tr></table>

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If S denotes the area of the curved surface of a right circular cone of height h and semivertical angle a then S equals

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