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L= 2πr(r+t)
7536=2.3,14.r(r+40)
1200=r(r+40)
1200=r²+40r
0=r²+40r-1200
0=(r+60) (r-20)
r=-60 atau r=20
a. yang akan kita pakai adalah r=20 karena r tidak mungkin negatif
b. diameter=rx2
d=2 x 20
d=40cm
t = 40 cm
Dit : a . r .....?
b. d ......?
Jwb :
Lp = 2 r (r+t)
7.536 = 2 . 3,14 . r (r+40)
7.536 = 6,28 . r (r+40)
7.536 / 6,28 = r (r+40)
1200 = + 40r
+ 40r - 1200 = 0
(r + 60) (r - 20) = 0
r = -60 cm V r = 20 cm
Maka a. r = 20 cm
b. d = 2 . r = 2 . 20 = 40 cm