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प्रश्न
If the points (2, 1) and (1, -2) are equidistant from the point (x, y), show that x + 3y = 0.
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उत्तर
Let p(x, y), Q(2, 1), R(1, -2) be the given points
Here `x_1 = x`, `y_1 = y`
`x_2 = 2, y_2 = 1`
The distance between two points
p(x,y) and Q(2, 1) is given by
`PQ = sqrt((2- x)^2 + (1 - y)^2)`
Similarly
Now both these distance are given to be the same
PQ = PR
`sqrt((2- x)^2 + (1 - y)^2) = sqrt((1 - x)^2 + (-2 - y)^2)`
Squaring both the sides
`=> sqrt((2- x)^2 + (1 - y)^2) = sqrt((1 - x)^2 + (-2 - y))`
Squaring both the sides
`=> (2 - x)^2 + (1 - y)^2 = (1 - x)^2 + (-2 - y)^2`
`=> 4 + x^2 - 4x + 1 + y^2 - 2y = 1 + x^2- 2x + 4 + y^2 + 4y`
`=> 4 + x^2 - 4x + 1 + y^2 - 2y -1 - x^2 + 2x - 4 - y^2 - 4y = 0`
`=>-2x - 6y = 0`
`=> -2(x + 3y) = 0`
=> x + 3y = 0
Hence prove
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Case Study -2
A hockey field is the playing surface for the game of hockey. Historically, the game was played on natural turf (grass) but nowadays it is predominantly played on an artificial turf.
It is rectangular in shape - 100 yards by 60 yards. Goals consist of two upright posts placed equidistant from the centre of the backline, joined at the top by a horizontal crossbar. The inner edges of the posts must be 3.66 metres (4 yards) apart, and the lower edge of the crossbar must be 2.14 metres (7 feet) above the ground.
Each team plays with 11 players on the field during the game including the goalie. Positions you might play include -
- Forward: As shown by players A, B, C and D.
- Midfielders: As shown by players E, F and G.
- Fullbacks: As shown by players H, I and J.
- Goalie: As shown by player K.
Using the picture of a hockey field below, answer the questions that follow:
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A point (x, y) is at a distance of 5 units from the origin. How many such points lie in the third quadrant?
