The area of the region, inside the ellipse x2 + 4y2 = 4 and outside the region bounded by the curves y = |x| - 1 and y = 1 - |x|, is :
- 2 - 1
- 3( - 1)
- 2( - 1)
- 2 - 12
Answer
(3) 2( - 1)
Solution
[figure]
Ellipse: x24 + y21 = 1, a = 2, b = 1 area = ab = 2
y = 1 - |x| and y = |x| - 1 together bound the square with vertices ( 1, 0) and (0, 1), which lies inside the ellipse.
Area of square = 12 d1 d2 = 12 2 2 = 2
Required area = 2 - 2 = 2( - 1) sq. units
Answer: (3)