Geometría interactiva y funciones · AP Calculus AB/BC Unit 6 (Integration & Riemann Sums), A-Level Further Maths (Definite Integrals), College Calculus I.
Visualizador de sumas de Riemann e integral definida
Visualizador interactivo de sumas de Riemann e integración definida: límites y áreas bajo la curva
- Cálculo en cliente
- Sin registro
- Derivación en vivo
- Modo proyector
- Hoja de trabajo A4
Ventana de demostración geométrica● 60 FPS
Variables de control del experimento
tipo
porciones
método
Derivaciones y métricas en tiempo real
Integral analítica exacta I
--
Exact value via Fundamental Theorem of Calculus
Suma de Riemann actual S_n
--
Sum of partition area strips
Error absoluto
--
Discrepancy from exact value
Paso de la partición Δx
--
Δx = (b - a) / n
Derivación de fórmulas en tiempo real
Fórmula básica:
--Sustitución de valores:
--Conclusión: --
Ejemplos clásicos y análisis de errores en exámenes
AP Calculus Exam: Right Riemann Sum for ∫₀⁴ x² dx with n=4
Problema: For f(x) = x² on [0, 4] with n=4 equal subintervals, compute the Right Riemann Sum and determine if it overestimates or underestimates the exact integral.
Estrategia analítica: Step size Δx = (4-0)/4 = 1. Subinterval right endpoints: 1, 2, 3, 4 with values f(1)=1, f(2)=4, f(3)=9, f(4)=16. Since f(x) is monotonically increasing on [0, 4], the right sum strictly overestimates.
Derivación paso a paso:
- Step 1: Compute step size Δx = (4 - 0) / 4 = 1.
- Step 2: List right endpoints: x1=1, x2=2, x3=3, x4=4.
- Step 3: Evaluate function values: f(1)=1, f(2)=4, f(3)=9, f(4)=16.
- Step 4: Compute Right Riemann Sum R4 = 1 × (1 + 4 + 9 + 16) = 30.
- Step 5: Exact integral via FTC: [x³/3] from 0 to 4 = 64/3 ≈ 21.333.
- Step 6: Conclusion: Monotonically increasing function implies Right Riemann sum strictly overestimates (30 > 21.33).
⚠️ Error conceptual frecuente: Confusing monotonicity with concavity: Left/Right sum over/underestimation depends on f'(x), whereas Trapezoidal rule over/underestimation depends on f''(x) (concavity).
Hoja de indagación en clase y tareas
Q1. For a strictly convex (f''>0) increasing curve, does the Trapezoid rule overestimate or underestimate the exact integral?
Answer Key: Overestimates (secant lines lie strictly above the convex curve)
Q2. Compute the exact analytical value of ∫₁³ (2x + 1) dx.
Answer Key: 10 ([x² + x] evaluated from 1 to 3: (9+3) - (1+1) = 10)
Preguntas frecuentes y errores conceptuales
Why does Simpson's rule converge significantly faster than standard rectangular sums?
Rectangles approximate via degree 0 constants, trapezoids via degree 1 lines, but Simpson's rule fits degree 2 parabolas through every 3 consecutive points, giving O(Δx⁴) error convergence.