閉合三角形之兩內角為∠B=88°，∠A=42°，ABC按順時針方向排列，若CA之方位角為170°，則AB方位角位為？(A)38° (B)128°(C)218° (D)308°

問題詳情

43. 閉合三角形之兩內角為∠B=88°，∠A=42°，ABC按順時針方向排列，若CA之方位角為170°，則AB方位角位為？
(A)38°
(B)128°
(C)218°
(D)308°

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