20°15的余角为多少°

Question

20°15的余角为多少°

Answer 1

解：
如果两个角互为余角
那么两个角的和=90°
20°15’的余角
=90°-20°15’
=89°60’-20°15’
=69°45’
=69°+45÷60°
=69°+0.75°
=69.75°
20°15’的余角为69.75°

Answer 2

90°-20°15′
=69°45′

Answer 3

90°-20°15=69°45‘