378, 380

AB = BC = CD = AD = 10

BD = 12

BO = OD = 12/2 = 6

<AOB = 90^o

AO² = AB² — BO² = 100 — 36 = 64

√64 = 8

AO = OC = 8

AC = 8 * 2 = 16

S_ABD = 12 * 8/2 = 48սմ

S_լրիվ = 48 * 2 = 96սմ²

BC = 9

AD = 18

CD = 15

BC = AH = 9

HD = 18 — 9 = 9

CH² = CD² — HD² = 225 — 81 = 144

CH = √144 = 12

S = 9 + 18/2 * 12 = 162սմ²