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Q.1. How many trigonometric ratios are there for an acute angle in a right angled triangle?

6


Q.2. Which triangle is used in trigonometry?

Right-angled triangle


Q.3. In AABC, right angled at B, AB = 24 cm and BC = 7 cm. Determine sin A, cos A, sin C and cos C.Viva Voce: Making of a Clinometer - Class 10

sin A = 7/25, cos A = 24/25, sin C = 24/25, cos C = 7/25


Q.4. What is the value of Viva Voce: Making of a Clinometer - Class 10

1


Q.5. What is trigonometry

It is an important branch of mathematics. In this branch we deal with the relation and measurement of the sides and the angles of a triangle.


Q.6. Is each trigonometric ratip a real number?

Yes


Q.7. If the angle of elevation of an object is 30°, then tan 0 (where 0 is angle of elevation) is

tan θ = tan 30°= 1/√3


Q.8. If tan A = cot B, then is it right A + B = 90°?

Yes


Q.9. If tan (60° —α) = 1, then α is

15°


Q.10. A plane is observed to be approaching the airport. It is at a distance of 12 km from the point of observation and makes an angle of elevation of 30° at that point. What is its height above the ground?

6 km

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