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1. luas persegi : 15 × 15 : 225 ( s × s)
luas p. panjang : 12 × 20 : 240 ( p× l)
jumlah : 465 dikurang l. tidak diarsir : 395
hasil : 70
sekian. kalo salah mohon dikoreksi^^
pj persegi ABCD = s = 15 cm
pj persegi panjang = p = 20 cm
lebar persegi pj = l = 12 cm
misalkan luas daerah yg tdk diarsir = L1, luas daerah yg diarsir = L2.
L1 = (L ABCD - L2) + (L PQRS - L2)
⇔ 395 = (L ABCD + L PQRS) - 2 · L2
⇔ 395 = (15 × 15 + 20 × 12) - 2 L2
⇔ 395 = 465 - 2 L2
⇔2 L2 = 70
⇔ L2 = 35 cm² (B)
2. luas yg diarsir = × s²
= × 8 × 8
= 16 cm² (seharusnya jawabannya 16 cm²)