Երկրաչափություն 15․10․21

57․


<AOB – (<AOC – <COB) = <AOB – 15 = 155 – 15 = 140
140 : 2 = 70
<AOC = 70 + 15 = 85
AOC -= 85

59․

AOB կիսորդ = M, COD կիսորդ = N
<AOD = 90o
<AOD : 3 = <AOB + <BOC + <COD = 30 + 30 + 30
30 : 2 = 15
AON = 15 + 30 + 15 = 60o

61․

այո։ Օրինակ․ 200 ։ 2 = 100

ՏՆԱՅԻՆ․

58․

<BOC = <AOC : (<AOB + <BOC) = 108 : (3 + 1) = 27
<AOB = 27 * 3 = 81o

60․

<UOV = <ZOY : 2 + <XOY : 2
<XOZ = <ZOY + <XOY
<XOZ = <UOV * 2 = 80 * 2 = 160o

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