tolong jawab nomer 1 dengan caranya

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raoesium sama kaki
AB = AE + EF + BF
DC = EF = 12 cm
AD = BC = 17cm
DE = CF = tinggi = 15cm
AE = AD^2 - DE^2
AE = 17^2 - 15^2
AE = 289 - 225
AE = 64 = 8 cm
AE = BF = 8 cm
AB = 28 cm
Luas trapesium = 1/2 × jumlah sisi sejajar × tinggi
= 1/2 × (AB + DC ) × DE
= 1/2 × ( 28 + 12) × 15
= 1/2 × 40 × 15
= 1/2× 600
Luas = 300 cm^2
harga permukaan meja = 300 × 700 ,= Rp, 210.000,