Using integration find the area of the triangular region whose sides have the equations y =2x+1,y=3x+1 and x=4.
Using integration find the area of the triangular region whose sides have the equations y =2x+1,y=3x+1 and x=4.
Solution and Explanation
The equations of side of the triangle are y=2x+1,y=3x+1, and x=4.
To solving these equations, we obtain the vertices of triangle as A(0,1), B(4,13), and C
(4,9).
It can be observe that,
Area(ΔACB)=Area(OLBAO)-Area(OLCAO) =
\[\int_{0}^{4} (3x+1) \,dx\]\[-\int_{0}^{4} (2x+1) \,dx\]
=[\(\frac{3x^2}{2}\)+x]40-[\(\frac{2x^2}{2}\)+x]40
=(24+4)-(16+4)
=28-20
=8 units.
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Concepts Used:
Area between Two Curves
Integral calculus is the method that can be used to calculate the area between two curves that fall in between two intersecting curves. Similarly, we can use integration to find the area under two curves where we know the equation of two curves and their intersection points. In the given image, we have two functions f(x) and g(x) where we need to find the area between these two curves given in the shaded portion.
Area Between Two Curves With Respect to Y is
If f(y) and g(y) are continuous on [c, d] and g(y) < f(y) for all y in [c, d], then,
