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1. 2500 = 50 x a x 1/2
50 = a x 1/2
100 = a
alas = 100cm
2. 22/7 x d
88 = 22/7 x d
88 x 7/22 = d
d = 28
jari jari = 14cm
3. 2(p+l)
130 = 2(p+25)
130/2 = p + 25
65 = p + 25
65-25 = p
40 = p
panjang = 40cm
2.88: 22/7 = 14adalah Diameter nya, Jari jarinnya tinggal don't bagi dua, 7
3.130:25=5,2 (Persegi Panjang kan?)