问题
填空题
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______.
∵∠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′.