<p> ∠A=α<sub>AP</sub>-α<sub>AB</sub>=89°59′36″-44°54′48″=45°04′48″<br> △ABM中,∠ABM=180°-(∠A+∠1)=39°26′30″<br> AM=AB•sin∠ABM/sin∠1=284m<br> △ABN中,∠ABN=180°-(∠A+∠2)=76°18′48″<br> AN=AB•sin∠ABM/sin∠2=506.51m<br> MP=AP-AM=462m-284m=178m<br> NP=AN-AP=506.51m-462m=44.51m<br> MP的边长为178m,NP的边长为44.51m。</p>