SOLUTION: A circular sector AOB, centre O and radius 8 cm, contains an angle of {{{3pi/4}}} radians at the centre. The straight edges OA and OB are joined to form a right circular cone. Find

Algebra ->  Surface-area -> SOLUTION: A circular sector AOB, centre O and radius 8 cm, contains an angle of {{{3pi/4}}} radians at the centre. The straight edges OA and OB are joined to form a right circular cone. Find      Log On


   

Question 1117755: A circular sector AOB, centre O and radius 8 cm, contains an angle of 3pi%2F4 radians at the centre. The straight edges OA and OB are joined to form a right circular cone. Find the exact value of the curved surface area of the cone.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+%28+3%2Api%2F4+%29+%2F+%28+8%2Api%2F4+%29+=+3%2F8+
The area of the whole circle is:
+pi%2Ar%5E2+=+pi%2A64+
and
+%283%2F8%29%2A64pi+=+24pi+
The area of the sides of the right circular cone is 24pi