Mathematics
Assertion (A) : Slant height of a cone of height 4 cm and radius 3 cm is (4 + 3) cm = 7 cm.
Reason (R) : Curved surface area of a cone of radius r and slant height l is πrl.
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false
Related Questions
Directions:
From a solid cylinder of height 30 cm and radius 7 cm, a conical cavity of height 24 cm and of base radius 7 cm is drilled out.
Based on this information, answer the following questions:
65. The volume of the remaining solid is :
(a) 2856 cm3
(b) 3388 cm3
(c) 3672 cm3
(d) 4620 cm3
(a) 1870 cm2
(b) 2024 cm2
(c) 2178 cm2
(d) 2332 cm2
(a) 18 cm
(b) 25 cm
(c) 26 cm
(d) 32 cm
(a) 550 cm2
(b) 704 cm2
(c) 858 cm2
(d) 616 cm2
Assertion (A) : The total surface area of a right circular cone of slant height 13 cm and radius 5 cm is 90 π cm2.
Reason (R) : Curved surface area of a right circular cone is given by πr(l + r).
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false