Area functions from graphs The graph of ƒ is given in the figure. A(𝓍) = ∫₀ˣ ƒ(t) dt and evaluate A(2), A(5), A(8), and A(12).

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Step 1: Understand the problem. The function A(𝓍) = ∫₀ˣ ƒ(t) dt represents the area under the curve of ƒ(t) from t = 0 to t = 𝓍. To evaluate A(2), A(5), A(8), and A(12), we need to calculate the definite integral of ƒ(t) over the respective intervals.

Step 2: Analyze the graph. The graph of ƒ(t) consists of distinct geometric shapes: a quarter-circle with radius 2 (from t = 0 to t = 4), a triangle (from t = 4 to t = 8), and another triangle (from t = 8 to t = 12). The areas of these shapes can be calculated using geometric formulas.

Step 3: Calculate A(2). Since t = 2 lies within the quarter-circle, calculate the area of the sector of the circle from t = 0 to t = 2 using the formula for the area of a sector: (1/4)πr², where r = 2. Adjust the calculation for the portion of the quarter-circle up to t = 2.

Step 4: Calculate A(5) and A(8). For A(5), sum the area of the quarter-circle (from t = 0 to t = 4) and the area of the triangle from t = 4 to t = 5. For A(8), sum the area of the quarter-circle and the entire triangle from t = 4 to t = 8. Use the formula for the area of a triangle: (1/2)base × height.

Step 5: Calculate A(12). For A(12), sum the areas of the quarter-circle, the triangle from t = 4 to t = 8, and the triangle from t = 8 to t = 12. Note that the triangle from t = 8 to t = 12 has a negative area because it is below the t-axis. Use the same triangle area formula, but subtract the result.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Definite Integral

A definite integral represents the signed area under a curve between two points on the x-axis. It is denoted as ∫ₐᵇ f(t) dt, where 'a' and 'b' are the limits of integration. This concept is crucial for calculating the area function A(x) = ∫₀ˣ f(t) dt, which accumulates the area from 0 to x.

Area Under the Curve

The area under the curve of a function f(t) from a to b can be interpreted as the total accumulation of the function's values over that interval. This area can be positive or negative depending on whether the function is above or below the x-axis. Understanding how to calculate these areas is essential for evaluating A(2), A(5), A(8), and A(12) from the given graph.

Piecewise Functions

A piecewise function is defined by different expressions based on the input value. In this case, the function f(t) has distinct segments, including linear and circular arcs, which require separate calculations for each interval. Recognizing how to handle these segments is vital for accurately computing the area function A(x) at specified points.