a = y = apothem.
X = b/2 = 6/2 = 3.
r = 6 cm.
X^2 + Y^2 = r^2.
3^2 + Y^2 = 6^2.
9 + Y^2 = 36.
Y = 5.2 cm = a.
P = N * L = 6 * 6 = 36 cm.
A = aP/2 = 5.2 * 36 / 2 = 93.6 cm^2.
A = 2.60r^2 = 2.60 * 6^2 = 93.6 cm^2.
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