Area of Bounded Region JEE Notes | EduRev

Mathematics (Maths) Class 12

Created by: Tarun Kaushik

JEE : Area of Bounded Region JEE Notes | EduRev

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The space occupied by the curve along with the axis, under the given condition is called area of bounded region.

(i) The area bounded by the curve y = F(x) above the X-axis and between the lines x = a, x = b is given by 

Area of Bounded Region JEE Notes | EduRev

(ii) If the curve between the lines x = a, x = b lies below the X-axis, then the required area is given by

Area of Bounded Region JEE Notes | EduRev

(iii) The area bounded by the curve x = F(y) right to the Y-axis and the lines y = c, y = d is given by

Area of Bounded Region JEE Notes | EduRev

(iv) If the curve between the lines y = c, y = d left to the Y-axis, then the area is given by

Area of Bounded Region JEE Notes | EduRev

(v) Area bounded by two curves y = F (x) and y = G (x) between x = a and x = b is given by

Area of Bounded Region JEE Notes | EduRev

(vi) Area bounded by two curves x = f(y) and x = g(y) between y=c and y=d is given by 

Area of Bounded Region JEE Notes | EduRev

(vii) If F (x) ≥. G (x) in [a, c] and F (x) ≤ G (x) in [c,d], where a < c < b, then area of the region bounded by the curves is given as

Area of Bounded Region JEE Notes | EduRev

Area of Curves Given by Polar Equations

Let  f(θ) be a continuous function,  θ ∈ (a, α), then the are t bounded by the curve r = f(θ) and radius α, β(α < β) is

Area of Bounded Region JEE Notes | EduRev

Area of Parametric Curves

Let x = φ(t) and y = ψ(t) be two parametric curves, then area bounded by the curve, X-axis and ordinates x = φ(t1), x = ψ(t2) is

Area of Bounded Region JEE Notes | EduRev

Volume and Surface Area

If We revolve any plane curve along any line, then solid so generated is called solid of revolution.

1. Volume of Solid Revolution

1. The volume of the solid generated by revolution of the area bounded by the curve y = f(x), the axis of x and the ordinates

          Area of Bounded Region JEE Notes | EduRev

it being given that f(x) is a continuous a function in the interval (a, b).

2. The volume of the solid generated by revolution of the area bounded by the curve x = g(y), the axis of y and two abscissas y = c and y = d is

Area of Bounded Region JEE Notes | EduRev

it being given that g(y) is a continuous function in the interval (c, d).

Surface of Solid Revolution

(i) The surface of the solid generated by revolution of the area bounded by the curve y = f(x), the axis of x and the ordinates

Area of Bounded Region JEE Notes | EduRev

is a continuous function in the interval (a, b).

(ii) The surface of the solid generated by revolution of the area bounded by the curve x = f (y), the axis of y and y = c, y = d is

  Area of Bounded Region JEE Notes | EduRev

continuous function in the interval (c, d).

Curve Sketching

1. symmetry

  1. If powers of y in a equation of curve are all even, then curve is symmetrical about X-axis.
  2. If powers of x in a equation of curve are all even, then curve is symmetrical about Y-axis.
  3. When x is replaced by -x and y is replaced by -y, then curve is symmetrical in opposite quadrant.
  4. If x and y are interchanged and equation of curve remains unchanged curve is symmetrical about line y = x.

2. Nature of Origin

  1. If point (0, 0) satisfies the equation, then curve passes through origin.
  2. If curve passes through origin, then equate low st degree term to zero and get equation of tangent. If there are two tangents, then origin is a double point.

3. Point of Intersection with Axes

  1. Put y = 0 and get intersection with X-axis, put x = 0 and get intersection with Y-axis.
  2. Now, find equation of tangent at this point i. e. , shift origin to the point of intersection and equate the lowest degree term to zero.
  3. Find regions where curve does not exists. i. e., curve will not exit for those values of variable when makes the other imaginary or not defined.

4. Asymptotes

  1. Equate coefficient of highest power of x and get asymptote parallel to X-axis.
  2. Similarly equate coefficient of highest power of y and get asymptote parallel to Y-axis.

5. The Sign of (dy/dx)

Find points at which (dy/dx) vanishes or becomes infinite. It gives us the points where tangent is parallel or perpendicular to the X-axis.

6. Points of Inflexion

Area of Bounded Region JEE Notes | EduRev

 and solve the resulting equation.If some point of inflexion is there, then locate it exactly.

Taking in consideration of all above information, we draw an approximate shape of the curve.

Shape of Some Curves is Given Below

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

Area of Bounded Region JEE Notes | EduRev

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