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Bab Bangun DatarMatematika SMP Kelas VII
32] AE/AD = AG/AB
10/(10 + 4) = 15/(15 + p)
10 . (15 + p) = 15 . 14
150 + 10p = 210
10p = 210 - 150
p = 60/10
p = 6 cm
EF/CD = AG/AB
5/CD = 15/(15 + 6)
CD = 21 . 5 / 15
CD = 7 cm
luas ABCD = 1/2 . (CD + AB) . AD
luas ABCD = 1/2 . (7 + 15 + 6) . (10 + 4)
luas ABCD = 1/2 . 28 . 14
luas ABCD = 196 cm
jawabannya C
33] lebar foto = 40 - 3 - 3 = 34 cm
34/40 = a/60
a = 34 . 60 / 40
a = 51 cm
luas karton yang tidak ditutupi foto
= luas karton - luas foto
= 40 x 60 - 34 . 51
= 2.400 - 1.734
= 666 cm²
jawabannya B
34] bola
r = d/2 x 14/2 = 7 m
luas belahan = 3 x π x r x r
luas belahan = 3 x 22/7 x 7 x 7
luas belahan = 462 m²