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Verified answer
Kelas 8 MatematikaBab Bangun Datar
Tinggi alas segitiga
= (30 - 12)/2
= 18/2
= 9 cm
Karena sudut = 45°, maka terbentuk segitiga siku-siku sama kaki, sehingga
Tinggi segitiga = panjang alas segitiga
Tinggi segitiga = 9 cm
Luas = 1/2 . jumlah sisi sejajar . t
Luas = 1/2 . (12 + 30) . 9
Luas = 1/2 . 42 . 9
Luas = 21 . 9
Luas = 189 cm²