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Kelas 8 MatematikaBab Bangun Datar
Tinggi trapesium
= 12 + 8
= 20 cm
Alas segitiga
= √(25² - 20²)
= √(625 - 400)
= √(225)
= 15 cm
Alas trapesium
= 4 + 12 + 4 + 15 + 15
= 50 cm
Luas trapesium utuh
= 1/2 . jumlah sisi sejajar . t
= 1/2 . (4 + 12 + 4 + 50) . 20
= 70 . 10
= 700 cm²
Luas daerah yang diraster
= luas trapesium - luas persegi panjang
= 700 - (p . l)
= 700 - (12 . 8)
= 700 - 96
= 604 cm²