Tolong jawab pake caranya nomor 35 dan 36

35.
Lp = 3x4 + (3+4+5)X6
= 12 + 72
= 84 cm²

36.
770 = 22/7 x r² x 20
r² = 770x7/440
r² = 12,25
r = √12,25
r = 3,5 dm
d = 2 x 3,5 = 7 dm