In the window of our house, there is a ladder at an angle of 60^o with the ground. If the ladder is 2√3m. long, then let us write by calculating with figure, the height of our window above the ground.

If then let us write by calculating, the value of cos C × cosec C.

Let us write with reason whether the following statements are true or false :

i. The value of tan A is always greater than 1.

ii. The value of cot A is always less than 1.

iii. For an angle θ, it may be possible that

iv. For an angle α, it may be possible that,

v. For an angle β (Beta) it may be possible that,

vi. For an angle θ, it may be possible that,

ABC is a right angled triangle with its ∠B is 1 right angle. If AB = 8√3 cm. and
BC = 8 cm., then let us write by calculating, the values of ∠ACB and ∠BAC.

In a right angled triangle ABC, ∠B=90°, ∠A=30° and AC = 20 cm. Let us determine the lengths of two sides BC and AB.