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2500=s2 ➡ s=akar2500=50cm
K= 4×s=4×50=200cm
3.L=1/2×a×t = 1/2×60×40=1200 cm2
K= 60+50+50=160cm
4.L=a×t=10×8=80m2
K=2(10+10)=2×20=40m