1.

Curved surface are of conical cup is `154sqrt(2) cm^(2)` and base radius is 7 cm. Find the angle at the vertex of the conical cup.A. `90^(@)`B. `60^(@)`C. `45^(@)`D. `30^(@)`

Answer» Correct Answer - A
Use, `tan((theta)/(2))=(r )/(h) " and find " theta.`


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