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43. a) Hexań ZB- 110°. Cywa cyciAHix Ky-riB 180°.

ZA = 180° - 110° = 70° .

OCKUlbKH npOTMAe>KHi KyTH piBHi, MaCMO ZA = ZQ-7Q

ZB = ZD = 110°.

6) HexaM ZA AopiBHioe x, OCKUlbKH npOTH/re>KHi KyTH piBui, toAawi KyTH cyciAui. ZB AOpiBHioe (x + 70°').

CyMa cyciABix KyTiB (x ♦ x + 70) , a6o 180®. x + x + 7 = 180 ; 2x + 70 = 180 ; 2x=U0 ; * = 55.

Z A = ZC = 55° , Z£ = ZZ> = 125\

b) OcKijibKH cyna cyciAHix KyriB 180°, to .nam KyTH npoTHaewHi. riponuiewm KyTH napaufieAorpaMa piBHi, orae, Z A = ZC = 90® : 2 = 45° .

Z B = 180° - 45° = 135° , Z B = Z D = 135® hk npoTHJie>KHi KyTH. r) Hexaw Z BAC = 45°; ZCAD = 30®, ZA* 45® + 30° = 75° , aa BJiacTMBicTio BHMipjOBaHHa KyTiB.

Z A = ZC = 75® uk npoTHJic>KHi KyTH uap&ne.norpaMa.

OcKijibKH cyna cyciAuix KyTia 180°,

ZB = 180°-75® = 105®.

Z B = Z D - 105® , ak npoTHAe>KHi KyTH.

Bidnouidb: a) 70°; 110°; 70°; 110°. 6) 55°; 125°; 55®; 125®. b) 45°; 135°; 45®; 135°. r) 75°; 105°; 75°; 105®.

Peiue6a.MM