sukartiningsihs
Sorry haruse 31t yaitu dari 12t + 6t +13t=31t
faradithanp
LP Prisma : 2 x La + Ka x t La = a x t / 2 = 5 x 12 / 2 =30 cm phytagoras = 12² + 5²= 13 Ka = 12 + 5 + 13 = 30 cm 900 cm2 = 2 x 30 + 30 x t 900 cm2 = 60 + 30 t 900 - 60 = 30 t 840 = 30 t t = 840 / 30 = 28 cm
= akar(12^2 + 5^2)
= akar 169
= 13
L permukaan
2. L alas + 12. t + 6t + 13t = 900
2. 1/2 . 12. 5 + 21t = 900
60 + 21t = 900
21t = 900 - 60
21t = 840
t = 840/21 = 40 cm
La = a x t / 2
= 5 x 12 / 2 =30 cm
phytagoras = 12² + 5²= 13
Ka = 12 + 5 + 13 = 30 cm
900 cm2 = 2 x 30 + 30 x t
900 cm2 = 60 + 30 t
900 - 60 = 30 t
840 = 30 t
t = 840 / 30 = 28 cm