jawab tolong no 57 sampai 59

57.
d = 30, r = 30 : 2 = 15

L = πr²
L = 3,14 × 225 = 706,5 cm² (B)

58.
lebar persegi panjang = 5, sama dgn sisi sebelahnya

L pp = 8 × 5 = 40

L ll = ½ × 11 × 6 = 33

L seluruh = 40 + 33 = 73 cm² (B)

59.
L bk besar = ½ × 12 × 12 × 2 = 144

L arsir = 144 - (18×2), dikali 2 krn bertumpuk
L arsir = 144 - 36 = 108 cm² (B)

sip, b smuaa :v
*) pp = persegi panjang
*) ll = layang layang
*) bk = belah ketupat

semoga membantu :)