Jawabanmu

2014-05-29T23:55:12+07:00
L = 84
l = p-5
p = ?

L = p x l
84 = p(p-5)
84 = p² - 5p
p² - 5p - 84 = 0
(p-12)(p+7) = 0
p1 = 12
p2 = -7 (panjang tidak mungkin minus) 

L = p x l
84 = 12 x l
l = 7

K = 2(p+l)
= 2(12+7)
= 2(19)
= 38 WebRepcurrentVotenoRatingnoWeight
Tolong lebih detail lg kak . Gimana cari p sm l.nya
sudah aku betulkan ya :)