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Active Calculus - Multivariable

Activity 12.4.2.
Let \(D\) be a half-disk lamina of radius 3 in quadrants IV and I, centered at the origin as shown in Figure 12.4.1. Assume the density at point \((x,y)\) is given by \(\delta(x,y) = x\text{.}\) Find the exact mass of the lamina.
Figure 12.4.1. A half disk lamina