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t AE = 71,5 x 2 : 20 = 7,15 cm
2) a. gambar sendiri
b. T (-1,-2)
c. L PQR = 1/2 x 6 x 4 = 12 cm2
3) banyak ubin = = 1200 buah
biaya = 1200 x Rp 5500 = Rp 6600000
4) biaya = 1/2 x 16 x 24 x 15000 = Rp 2880000