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28. AB is a line-segment. P and Q are points on opposite sides of AB such that each of them is
equidistant from the points A

By Cora

28. AB is a line-segment. P and Q are points on opposite sides of AB such that each of them is
equidistant from the points A and B (see below left figure). Show that the line PQ is the
perpendicular bisector of AB.
P
A
D
A
B
С
B
Q
C
29. ABCD is a quadrilateral in which AD = BC and ZDAB = {CBA (see the above right sided
figure). Prore that (1) A ABDYA BAC (ii) BD = AC (ii) ABD = <BAC.​

About the author
Cora

A proton moves from large distance, with a

speed of v m/s directly towards a free proton

initially at rest

Correct
02= ‘Find the square root of the following
to three decimal
places!
10 239.421​

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