# Explanation needed 1) Find the coordinates of the points symmetric with respect to X-axis, to the following points. Plot the points. (a) A(2,3) ; (b) B(-3,2) ; (c) C(-1,-1) ; (d) D(-3,4) 2) Extremities of the diagonal of a parallelogram are the points (1,2) and (5,4). Third vertex is the points (2,3). Then the fourth vertex is {answer should come (4,3)} 3) Find the distance between two points whose polar co-ordinates are {answer should come}

1
by jafiya

2015-01-15T13:46:02+05:30

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Symmetric wrt x axis means, the y coordinate changes sign.
a) A' = (2,-3)    B'  =(-3,-2)  C' = (-1, 1)

A= (1,2)  B=(2,3)  c=(5,4)  D(x,y)
slope AB = (3-2)/(2-1) = 1
slope BC = (4-3)/(5-2)  = 1/3
Slope CD = (y-4)/(x-5) = 1  =>  y + 1 = x
Slope DA = (y-2)/(x-1) = 1/3  =>  3 y - 5 = x
solving  x = 4  y = 3

distance² = √[ (4 Cos π/2 - 2 cos π/3)² + ( 4 sin π/2 - 2 cos π/3)² ]
= √ [ 1 + (4-√3)² ] = √[ 20 - 8√3 ]

sir how to solve for x and y in second sum please show
y+1 = x and 3y - 5 = x ... solve these two. is it not simple.