● Total area `A` of the region between x-axis, ordinates `x = a, x = b` and the curve `y = f (x)` as the result of adding up the elementary areas of thin strips across the region PQRSP. Symbolically, we express
● Here, we consider vertical strips as shown in the Fig
`color{blue} {A = int_a^b d A = int_a^b ydx = int_a^b f(x) dx}`
● Total area `A` of the region between x-axis, ordinates `x = a, x = b` and the curve `y = f (x)` as the result of adding up the elementary areas of thin strips across the region PQRSP. Symbolically, we express
● Here, we consider vertical strips as shown in the Fig
`color{blue} {A = int_a^b d A = int_a^b ydx = int_a^b f(x) dx}`