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21.0/.2022., standard, Example bi2l,, tower., hye, 30°, 2 adj A ?aj D., To Find CD=?, Let AB be the towes, let CA =X , AD=y., In A ABC, AB, tan 30, CA, tan30, 900, - 200, x = 20013, In AABD., tan 45°a, AD., AB, 200, 8= 200., . Now,, CD X+y., こ20o3+ 800, = R00 ( 13 +1)

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In ARD., Lanbo, BD, AB, 18., 80+h, 2 1.960, 义2, 30+h, put x- 30, B., 30, 20+h", 1), 2.732, -1.000, 2013-30 =h., 0:73 2, - 20 CB-1)., = 30 (lo732-1), 30(0.132), .'' The height of the tower is a1.96m., a1.96m, Example: 6.23, 30°, 58°, D', 2om, Let AB be the height of Hthe towes., Let Be be the width of the canal., Cef Bc - x, AB-h: