Important Question For CBSE Class X Mathematics Board Examination 2009-10

Set - 4

Q. 1. The hypotenuse of right triangle is. If the smaller leg is tripled and the longer leg doubled, new hypotenuse will be 9Ö5 cm. How long are the legs of the triangle?

Q. 2. The shadow of a tower, standing on level ground is found to be 45 m longer when the Sun’s altitude is 300 than when it was at 60⁰. Find the height of the tower. (Correct to 2 places of decimal).

Q. 3. The angle of elevation of an aeroplane from a point P on the ground is 60o. After a flight of 15 seconds. The angle of elevation changes to 300. If the aeroplane is flying at a constant height of 1500Ö3 m, find the speed of aeroplane................

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