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maaf salah soalnya lupa rumusnya
alas = 13 cm
tinggi. = 30 - 13= 17 cm
luas segitiga = alas x tinggi
2
= 13 cm x 17cm
2
= 221cm²
2
= 110,5cm²
bangun 2 = persegi
sisi. = 18 cm
luas persegi = sisi x sisi
= 18 cm x 18 cm
= 324 cm²
luas gabungan = luas segitiga + luas persegi
= 110, 5cm² + 324cm²
= 434, 5 cm²
maaf kalo salah :D