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nomor 8.semoga bermanfaat

7. luas persegi panjang = p × l = 14 × 20 = 280
     luas trapesium = (a+b) x t/2 = (30+20) x16/2 = 50 x 16/2 = B. 400
8. k =...............
    k setengah lingkaran = 1/2 × 22/7 × 28 = 616/14 = 44
    k = 44 + 22 + 28 + 22 =  C. 116