题目内容
若∠1=20°18′,则90°-∠1=
69
69
°42
42
′.分析:代入后得出89°60′-20°18′,相减即可求出答案.
解答:解:∵∠1=20°18′,
∴90°-∠1
=90°-20°18′
=89°60′-20°18′
=69°42′,
故答案为:69,42.
∴90°-∠1
=90°-20°18′
=89°60′-20°18′
=69°42′,
故答案为:69,42.
点评:本题考查了度分秒的换算的应用,注意:1°=60′,1′=60″.
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