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Jika AD tegak lurus dengan BC (lihat gambar)Cari panjang AD dengan kesebangunan
AD² = BD × CD
AD² = 9 × 4
AD² = 36
AD = √36
AD = 6 cm
Cari luas
Luas = 1/2 × a × t
Luas = 1/2 × (4+9) × 6
Luas = 1/2 × 13 × 6
Luas = 39 cm²