In this post, you’ll find the formula used to find area by integration.
Finding area between curve and x-axis
To find the area bounded by the curve y = f(x), the x-axis, the lines x= a and x= b:
Note that area is a positive value. Hence, if the area lies beneath the x-axis, you’ll need to add | | or a negative sign in front of it to make it positive.
To find the area bounded by the curve x = g(y), the y-axis, the lines y= a and y= b:
Note that area is a positive value. Hence, if the area lies beneath to the left of the y-axis, you’ll need to add | | or a negative sign in front of it to make it positive.