题目：
已知∠A=21°24′，它的余角为______．
答案：
∵∠A=21°24′，
∴它的余角为90°-∠A
=90°-21°24′
=89°60′-21°24′
=68°36′．
故答案为：68°36′．
已知∠A=21°24′，它的余角为______．
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