# Class 10th maths science group Chapter 7 Exercise 7.5

## Class 10th maths science group Chapter 7 Exercise 7.5

Class 10th maths science group Chapter 7 Exercise 7.511/11/2017 02:46:50 pm - notes - 10th - Mathematics Science Group - administrator
This series of lecture is about class 10th maths book exercise 7.5. You will get the lectures and notes about all the exercises of maths 9th, 10th, 11th, 12th. These lectures are related to Punjab Textbook Board PTB, Federal Board, Rawalpindi Board and all other educational boards of Punjab.
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This Lecture includes complete notes of Exercise 7.5 Chapter 7 Introduction to Trigonometry from class 10th maths (science group) Punjab Text Book Board. For FBISE, RWPBISE and all other boards like Lahore Board, Sargodha Board etc.
In this Lecture you will go through following Topics:
1. Introduction to Trigonometry
i) Angle of Elevation and Angle of Depression
Cant see the pdf file? Click here

Select a Question from the list bellow to see the video of that Question directly (works best in Google Chrome Browser):
Q. 1:	Find the angle of elevation of the sun if a 6 feet man casts a 3.5 feet shadow.
Q. 2:	A tree casts a 40 meter shadow when the angel of elevation of the sun is 25o. Find the height of the tree.
Q. 3:	A 20 feet long ladder is leaning against a wall. The bottom of the ladder is 5 feet from the base of the wall. Find the acute angle (angle of elevation) the ladder makes with the ground.
Q. 4:	The base of a rectangle is 25 feet and the height of the rectangle is 13 feet. Find the angle that the diagonal of the rectangle makes with the base.
Q. 5:	A rocket is launched and climbs at a constant angle of 80o. Find the altitude of the rocket after it travels 5000 meter.
Q. 6:	An aeroplane pilot flying at an attitude of 4000m wishes to make an approach to an airport at an angle of 50o with the horizontal. How far from the airport will the plane be when the pilot begins to descent?
Q. 7:	A guy wire (supporting wire) runs from the middle of a utility pole to the ground. The wire makes an angle of 78.2o with the ground and touch the ground 3 meters from the base of the pole. Find the height of the pole.
Q. 8:	A road is inclined at an angle 5.7o. Suppose that we drive 2 miles up this road starting from sea level. How high above sea level are we?
Q. 9:	A television antenna of 8 feet height is located on the top of a house. From a point on the ground the angle of elevation to the top of the house is 17o and the angle of elevation to the top of the antenna is 21.8o. find the height of the house.
Q. 10:	From an observation point, the angles of depression of two boats in line with this point are found to 30o and 45o. Find the distance between the two boats if the point of observation is 4000 feet high.
Q. 11:	Two ships, which are in line with the base of a vertical cliff, are 120 meters apart. The angles of depression from the top of the cliff to the ships are 30o and 45o, as shown in the diagram.
(a)	Calculate the distance BC
(b)	Calculate the height CD, of the cliff.

Q. 12:	Suppose that we are standing on a bridge 30 feet above a river watching a log (piece of wood) floating toward us. If the angle with the horizontal to the front of the log is 16.7o and angle with the horizontal to the back of the log is 14o. How long is the log?

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