已知弦长b=3.74米,弓形的高h=0.265米,求弓形的面积.【是这个意思吧?】先求园弧半径R=(b²+4h²)/8h=(3.74²+4×0.265²)/(8×0.265)=14.2689/2.12=6.731米再求园心角θ=4arctan(2h/b)=4arc(2×0.265...