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2.) Luas persegi panjangLuas = p x l
Luas = 20 cm x 15 cm
Luas = 300 cm²
Luas segitiga
= ½ x a x t
= ½ x 20 x 5
= 10 x 5
= 50 cm²
Luas bangun
= 300 cm² + 50 cm²
= 350 cm² (C)
5. Luas trapesium
= ½ x (a + b) x t
= ½ x (10 + 18) x 10
= ½ x 28 x 10
= 14 x 10
= 140 cm²
Luas segitiga
= ½ x a x t
= ½ x 10 x 6
= 10 x 3
= 30 cm²
Luas gabungan
= 140 cm² + 30 cm²
= 170 cm² (D)