Question
The radii of the ends of a frustum of a solid
right-circular cone 45 cm high are 28 cm and 7 cm. If this frustum is melted and reconstructed into a solid right circular cylinder whose radius of base and height are in the ratio 3 : 5, find the curved surface area (in cm²) of this cylinder. [Use π = 22/7.]Solution
Radius of cylinder =3x and height =5x The volume of the Frustum: V = 1/3 πh (R² + r² + Rr) = 1/3π×45× (72 + 282 +28×7)  = π ×15(49+784+196) = π ×15×1029 V=15435 π Volume of the Cylinder:  V = πr²h = 15435π π ×9x2×5x =15435 π 45x3=15435 x3=15435/45=343 x=7 r =3x =3×7= 21 cm, h =5x=5×7= 35 cm Curved Surface Area of the Cylinder: A = 2πrh = 2 × 22/ 7 x 21 x 35 =132×35 =4620 cm² Thus, the curved surface area of the cylinder is 4620 cm².
Answer the following question based on the direction given below:
If 'A#B' means 'A is the father of B' 'A@B' means 'A is the brother of B' '...
If 'A + B' means that A is the brother of B, 'A X B' means that A is the daughter of B, 'A ÷ B' means that A is the father of B, then which of the fol...
In expression I @ P % K $ O @ G # N % F, how is P related to F’s sister?
If the expression ‘S&R @ Q * P, S % T * U and V # U’ are true, then how is V’s only niece related to the person married to P?
Answer the following question based on the direction given below. If ‘A#B’ means ‘A is father of B’ ‘A@B’ means ‘A is daughter of B’ ‘...
If expression ‘R % T $ S # U $ V’ is true, then how is wife of V related to T’s mother?Â
If G @ H & I % J @ L ^ K then how is J related to H?
'A # B' means 'A is the brother of B'. 'A @ B' means 'A is the daughter of B'. 'A & B' means 'A is the husband of B'. 'A % B' means 'A is the wife of B'...
'A + B' means 'A is the sister of B'. 'A - B' means 'A is the brother of B'. 'A X B' means 'A is the father of B'. 'A ÷ B' means 'A is the wife of B'. ...
If 'A@B' means 'A is father of B', 'A#B' means 'A is wife of B', 'A$B' means 'A is sister of B', 'A%B' means 'A is brother of B'. If 'R @ S $ T # V @ U ...
Relevant for Exams:
