Numerical answer
Find the area of the region lying inside the circle and on or above the parabola . Give the answer correct to two decimal places.
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Answer: 7.62
Eliminate : gives , so and the curves meet at . Between and the upper boundary is the upper semicircle and the lower boundary is the parabola. Area . Using , the circle part from to equals . The parabola part is . So the area is , i.e. . The two intersection points lie on the circle since , and the parabola is below the upper semicircle between them, which justifies the choice of upper and lower curves in the integral. The answer is rounded to two decimals.
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