Question

Tolong bantu yak kak no 16 17

Answer 1

16) misal
r = 3x
t = 5x
Lsel = 2πrt
480π = 2π 3x × 5x
480π/2π = 15x^2
x = √240/15
x = √16
x = 4
jadi...
r = 3x = 3 x 4 = 12 cm,,
t = 5x = 5 x 4 = 20 cm

17) Lsel = 2πrt
126π = 2πr x 10,5
126π/2π = 10,5r
r = 63/10,5
r = 6 cm

Lalas = πr^2
= π6^2
= 36π cm2,,