panjang:lebar=7:5.keliling=120m luasanya adalah.....m2
Matematika
talitha92
Pertanyaan
panjang:lebar=7:5.keliling=120m luasanya adalah.....m2
2 Jawaban
-
1. Jawaban keruasriki
K = 120
2(p+l) = 120
p + l = 120/2
p + l = 60
p : l = 7 : 5
p = 7/(7+5) × 60 = 7/12 × 60 = 7×5 = 35 m
l = 60 - 35 = 25 m
Luas = 35×25 = 875 m^2 -
2. Jawaban echayoo
7x:5x
kell = 2x (7x+5x)
120 = 2 x 12x
120 = 14x
x= 8,5
Panjang= 59,5
lebar = 42,5
Luas =PXL
luas= 59,5 x 42,5= 2528,75 m2