flyDear梦:
是内圈半径为72.6米吗.则外圈半径为(72.6+1.25)米=73.85米
85.98m×1.25m×2+[(73.85m)²-(72.6m)²]×3.14
=214.95m²+[5453.8225m²-5270.76m²]×3.14
=214.95m²+183.0625m²×3.14
=214.95m²+574.82m²
=789.77m²
答:跑道占地面积为789.77平方米
祝好,再见.
flyDear梦:
是内圈半径为72.6米吗.则外圈半径为(72.6+1.25)米=73.85米
85.98m×1.25m×2+[(73.85m)²-(72.6m)²]×3.14
=214.95m²+[5453.8225m²-5270.76m²]×3.14
=214.95m²+183.0625m²×3.14
=214.95m²+574.82m²
=789.77m²
答:跑道占地面积为789.77平方米
祝好,再见.