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140 cm = 4(20+10+t)
140=120+4t
20=4t
5=t
Lp=2(pl)+2(pt)+2(lt)
Lp=2(20x10)+2(20x5)+2(10x5)
Lp=400cm+200cm+100
Lp=700 cm²
semoga bermanfaat
80 + 40 + 4t = 140
4t = 140 - 120
4t = 20
t = 5 cm
Lp = 2pl + 2lt + 2pt
= ( 2 x 20 x 10) + (2 x 10 x 5) + (2 x 20 x 5)
= 400 + 100 + 200
= 700 cm²