[填空题]
Two hot air balloons, located at poqq+9ev5s 77h xx-5.5y y:yospdo kyx fints A a;o n2gyvr auv+c,nbf v4,li l6i:/wn1nd B, float in the sky 50 m apart from each other on the same height above a flat (horizontal) ground. Two stra/v+42yl;,v o i nnl6vr,1 wan:bifcugight ropes, AP and BP, are attached to the same point, P, on the ground. The length of AP is
36m and angle $\mathrm{A}\hat{\mathrm{B}}\mathrm{P}$ is $45^{\circ}$.
1.On the diagram, draw and label with an $\alpha$ the angle of elevation of A Angle APB is acute.
2.Find the size of angle $\mathrm{A}\hat{\mathrm{P}}\mathrm{B}$. $^{\circ}$
3.Find the size of the angle of elevation of A from P. $^{\circ}$
