Definite Integral: Area of a Curvilinear Triangle under a Quadratic Function

This applet demonstrates using definite integrals to calculate the area of a curvilinear triangle bounded by a quadratic function. It dynamically visualizes upper and lower Riemann sums, providing an intuitive understanding of partitioning, summation, and limits, illustrating the geometric meaning of definite integrals and area calculation for polynomials.