# aieee-notes_aieee-notes-mathematics_03

W
Shared by:
Categories
Tags
-
Stats
views:
16
posted:
9/18/2012
language:
English
pages:
1
Document Sample

```							                                                              AIEEE
and other Entrance Exams
MATHEMATICS Notes & Key Point
HEIGHTS AND DISTANCES                                                                                         Chapter - 3

1. Introduction
• Let ' O' be the observer's eye and OX be the horizontal line through O .

• If the object P is at a higher level than O , then angle POX( = θ) is called the angle of elevation .

• If the object P is at a lower level than O , then angle POX is called the angle of depression.

in
. co.
e rs
ach
2. Some results that will be useful in solving problems
In a triangle ABC ,
e   te
lin
• If AD is median, then AB2 + AC 2 = 2 AD 2 + BD 2     (          :/ /on )
p
ht t
m
d f ro
d   e
n    loa                                              A

ow
• If AD is the angle bisector of ∠BAC .then
D                                                 c
A/2 A/2
b
BD AB c
=  =
DC AC b                                                                     θ
B            D              C

• If a line is perpendicular to a plane, then it is perpendicular to every line lying in that plane .

Downloaded from http://onlineteachers.co.in, portal for CBSE, ICSE, State Boards and Entrance Exams.
Prepared by Alpha Education , Sec-4, Gurgaon, Haryana. sales@onlineteachers.co.in

```
Related docs
Other docs by anshu8765
aieee-notes_aieee-notes-physics_01
aieee-notes_aieee-notes-mathematics_02