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2. L= s×s
2500 =s^2
50 cm =sisi = AB
3. 1/2 × a × t
1/2 × 60 ×40 = 1200
9. phi r^2
22/7 × 21 × 21 = 1386 m^2
yg ga tak isi, lupa rumusnya apa. coba dibuka bukunya dulu, pasti ada