Exercise 9C, D 3, New Syllabus Mathematics 7th Edition, Question 7 to 12, Solved by Ferhan Mazher

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Exercise 9C, D 3, New Syllabus Mathematics 7th Edition, Question 7 to 12, Solved by Ferhan Mazher, CAIE, Cambridge O Level, DMath4024,
Question 7 to Question 12,
Three Dimensional Problems, Angle of Elevation in a three Dimensional Problem, Angle of Depression in a three Dimensional Problem, Application of Trigonometry,
CAIE, Cambridge, O Level, D Math 4024,
Solved by Ferhan Mazher
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How do we know that the angle DAT is 90°. q no12 last part. Please guide

jawariarehman