In Rt△AOB, d2=(3h)2+h2-2? 3h？ Hcos30, where d=20 and h=20,

So the height of the flagpole is 20.

(2)∵tanα=hd+dh4，tanβ=4d

∴tan(β-α)=4d？ 4hd(h+4) 1+ 16hd 2(h+4)= 16dd 2(h+4)+ 16h = 16d(h+4)+ 16hd≤66。 Put away comments//high quality or satisfaction or special types or recommended answers dottimewindow.iperformance & window.iperformance.mark ('c _ best',+newdate); Lawyer recommendation service: If your problem has not been solved, please describe your problem in detail and consult other similar problems for free through Baidu Legal Professional Edition. As shown in the figure, when measuring the height of flagpole AB on September 6th, 2022, first choose a point C on the ground to make it 201-kloc-0/0-06. When measuring the height of flagpole AB, now choose a point C on the ground to make ∠ ACB = 15. In order to measure its height, the elevation of point P measured at point A is 30102020-01-03. As shown in the figure, when measuring the height AB of flagpole, first select a point C on the ground to make ∠ ACD = 15, and then move to point D, 420 13- in the direction of flagpole. Select a baseline AB 1320 12-02-04 on the ground. In order to measure its height, take a baseline AB AB=20m A on the ground and measure the elevation of point P ∠OAP=30, and measure point P 920 16- 12-06558 at point B, so that ∠ ACB = 15, and then

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