Notice!
BD is the diameter of the circle.
a = ½(BD)
a = ½(14)
a = 7 cm.
a is OB = OD.
a is the radius of the circle.
b = 2(45)
b = 90°
b is angle AOB.
Calculating shaded area.
It is;
Area quarter circle with radius 7 cm - Area triangle with height and base 7 cm respectively.
= ¼(7*7)π-½(7*7)
= ¼(49π)-½(49)
= ¼(49π-98)
= ¼(49(π-2)) square units.
= 13.9845100065 square units.
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