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Keliling = Keliling 3 buah (1/4 lingkaran) + Keliling pada persegi = 3 *1/4 *22/7 *2*7 + 2*7 = 33 +14 = 47 cm
Utk no 19
luas yg putih = persegi - 1/4 lingkaran
= 28*28 - 1/4 * 22/7 * 28 *28 = 784 -616 =168
Jadi luas diarsir = Persegi - 2 luas bagian putih
= 784 - 336 = 448 cm²
Semoga membantu
19. maaf, saya lupa