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5. Trigonometric Ratios
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Q30 of 143 Page 5

In a right triangle ABC, right angled at C, if = 60° and AB = 15 units. Find the remaining angles and sides.


In a right triangle ABC, right angled at C, if = 60° and AB = 15 units. Therefore,



And,




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28

If A = 30° and B = 60°, verify that

(i) .


(ii)

29

If sin (A - B) = sin A cos B – cos A sin B and cos (A - B) = cos A cos B + sin A sin B, find the values of sin 15° and cos 15°.

31

Ifis a right triangle such that = 90°, = 45° and BC = 7 units. Find , AB and AC.

32

In a rectangle ABCD, AB = 20 cm, = 60°, calculate side BC and diagonals AC and BD.

Questions · 143
5. Trigonometric Ratios
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