Question

Diket :
s : 26 cm
L. selimut : 408,2 cm₂
Ditanya :
a. r ?
b. L. kerucut ?

Answer 1

Diket :
s = 26cm
Ls = 408,2 cm
dit r dan Lp

Ls = πrs
408,2 = 3,14×r×26
408,2÷3,14 = 26r
130÷26 = r
5cm = r

Lp = πr²+Ls
Lp = 3,14×5²+408,2
Lp = 3,14×25+408,2
Lp = 78,5+408,2
Lp = 486,7cm²