In a sequence described by a function, what does the notation f(3) = 1 mean?
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so, if you notice the inscribed regular pentagon, it "emits" 5 radii from the center of the circle, making 3 equal angles.
well, a circle has a total of 360°, so each angle must then be 360°/5, or 72°.
if we notice the line on the right-side, the diameter of the circle is 16 units, meaning its radius is 8 units.
so a shaded section is really just the area of a segment of a circle with an angle of 72° and a radius of 8, keeping in mind we have 3 segments there.