a cone of height 28 cm has a surface area 2310 m2.the radius of the base is?
Answers
Answered by
0
Answer:
Let r cm be the radius and l cm the slant height. Then,
l²=r²+28²
l²=r²+784
l=√r²+784
Curved surface area = 2310 cm²
πrl=2310
22/7×r×√r2+784 =2310
r√r2+784=25×7
r²(r²+784)=25²×7²
+784r²−(625×49)=0
(r²+625)(r²−49)=0
r=7
Volume = 1/3πr²h
=1/3×22/7×49×24=1232 cm³
Similar questions