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secondary 3 | E Maths
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rei
Rei

secondary 3 chevron_right E Maths chevron_right Singapore

Hi how do I do this qn...thankyou so much in advance

Date Posted: 2 years ago
Views: 280

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Jackson Wan
Jackson Wan's answer
18 answers (Tutor Details)
1st
i) Using Sine rule,
BD/sin75 = AB/sin52 =49m/sin52
solve for length BD.

ii) Similarly solve for AD to find length AC=CD+DA
Use Cosine rule CB^2 = CA^2+49^2-2*AC*AB*Cos(75)
Solve for length CB
Find angle ACB using sine rule.

Draw a line pointing North passing through point B.
Bearing of C from B = 360deg-(180deg-angleACB)= 180deg+angleACB

b)Imagine right angle triangle with height 20m and base length = BD. Find the hypothenuse (E) using Pythagorean Theorem. E/sin90 = 20/sin(angle of depression)
Solve for angle of depression.