247-107=140
140:300=247:X
X=529,28
展开料外半径=√ (529,28² +247²)=584mm
展开料内半径=584-√ (140² +300²)=331mm
圆心角=494π ÷ (1168π÷360)=152,27°
扇形面积=0,584²π÷360×152,27-0,331²π ÷360×152,27
=0,3076m²
重量=0,3076×6×7,85=14,49公斤
247-107=140
140:300=247:X
X=529,28
展开料外半径=√ (529,28² +247²)=584mm
展开料内半径=584-√ (140² +300²)=331mm
圆心角=494π ÷ (1168π÷360)=152,27°
扇形面积=0,584²π÷360×152,27-0,331²π ÷360×152,27
=0,3076m²
重量=0,3076×6×7,85=14,49公斤