Matematika

Pertanyaan

Jika panjang AF=10 cm ,CG = 4 cm,EH=15 cm,dan BD = 8 cm,maka luas daerah arsiran ABCDE = . . . .
A. 54 C. 72
B. 78 D. 68
Jika panjang AF=10 cm ,CG = 4 cm,EH=15 cm,dan BD = 8 cm,maka luas daerah arsiran ABCDE = . . . . A. 54               C. 72 B. 78                D. 68

1 Jawaban

  • Labd = ½.8.10 = 40cm²
    Lbcd = ½.4.8 = 16 cm²
    Lbed = ½.15.8 = 60 cm²

    luas diarsir = Labc + Lcde
    Labc =Labd - Lbcd = 40 - 16 = 24 cm²
    Lcde = Lbed - Lbcd = 60 - 16 = 44 cm²
    luas diarsir = 24 + 44 = 68 cm2