1. One flies a kite with a thread 150 metre long. If the thread of the kite makes an angle of 60° with the horizontal line, then the height of the kite from the ground (assuming the thread to be in a straight line) is —

50 metre

75√3 meter

25√3 metre

80 metre


2. The simplified value of  (sec A - cos A)2 + (cosec A – sin A)2 – (cot A — tan A) is -

0

1/2

1

2

3. In a regular polygon, the exterior and interior angles are in the ratio 1 : 4. The number of sides of the polygon is

10

12

15

16

4. If the lengths of the three sides of a triangle are 6 cm, 8 cm and 10 cm, then the length of the median to its greatest side is

8 cm

6 cm

5 cm

4.8 cm

5. The circumcentre of a triangle ABC is O. If ㄥBAC = 85° and ㄥBCA = 75°, then the value of ㄥOAC is

40°

60°

70°

90°

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