Persiapan UN 2017 Diutamakan siswa - siswi SMP Gunakanlah cara / langkah yang baik

p = 3l
L = 72m²

L = p x l = 72
3l x l = 72
l² = 72/3 = 24
l = √24 = 2√6 m
p = 3 x 2√6 = 6√6 m

d = √p²+l² = √(6√6)²+(2√6)² = √(216+24) = √240 = 4√15 meter

jdik :
bangun persegi panjang
L = 72 m²
p = 3 x l = 3l

dit :
diagonal sisi?

jawab :

L = pl
72 = 3l x l
72 = 3l²
l² = 72/3
l² = 24
l = √24
l = √4.6
l = 2√6 m
p = 3 x 2√6 = 6√6

maka;
diagonal sisi
= √p²+l²
= √(6√6)²+(2√6)²
= √(36.6)+(4.6)
= √216+24
= √240
= √16.15
= 4√15 m