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For a point P in the plane, let d1(P)a n...

For a point `P` in the plane, let `d_1(P)a n dd_2(P)` be the distances of the point `P` from the lines `x-y=0a n dx+y=0` respectively. The area of the region `R` consisting of all points `P` lying in the first quadrant of the plane and satisfying `2lt=d_1(P)+d_2(P)lt=4,` is

Text Solution

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For P(x, y), we have
`2 le d_(1)(P) +d_(2)(P) le 4`
`rArr 2 le (|x-y|)/(sqrt(2)) + (|x+y|)/(sqrt(2)) le 4`
`2sqrt(2) le |x-y| +|x+y| le 4sqrt(2)`
In first quadrant, if `x gt y,` we have
`2sqrt(2) le x-y +x+y le 4sqrt(2)`
`"or " sqrt(2) le x le 2sqrt(2)`
The region of points satisfying these inequalities is

In first quadrant, if `x lt y`, we have
`"or " sqrt(2) le y le 2sqrt(2)`
The region of points satisfying these inequalities is

Combining above two regions, we have

Area of shaded region `=((2sqrt(2))^(2) - (sqrt(2))^(2))`
=8-2= 6 sq. units
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