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Jawaban:
1. L persegi + segitiga
= s x s + a x t :2
= 15 x 15 + 15 x 12:2
= 225 + 90
= 315 cm²
2. L persegi panjang+ segitiga
= p x l + a x t :2
=12 x 6 + 10 x 6:2
= 72 + 30
= 102 cm²
3.L persegi panjang+ segitiga
= p x l + a x t :2
= 6 x 3 + 3 x 3 :2
= 18 + 4,5
= 22,5 cm²
4.L persegi panjang+ segitiga
= p x l + a x t :2
= 12 x 8 + 8 x 3 :2
= 96 + 12
= 108 cm²
semoga membantu:)
jadikan jawaban terbaik ya ✨