Answer to Question #159851 in Geometry for Karneisha

Question #159851

A triangle is placed in a semicircle with a radius of 2mm what is the area of the shaded region use the value 3.14 and do not round the number





1
Expert's answer
2021-02-02T04:37:53-0500

1) with green checkmarks the segments, the area of which (S) I am looking for

2) S of semicircle = SsS_s




S = SsS_s - S(ABC)S\vartriangle(ABC)


Ss=12πR2=>123.144mm2=6.28mm2S_s = \tfrac{1}{2}\pi*R^2 => \tfrac{1}{2}*3.14*4 mm^2 = 6.28 mm^2

S(ABC)=12BOAC=122mm4mm=4mm2S\vartriangle(ABC) = \tfrac{1}{2} BO*AC = \tfrac{1}{2} *2mm*4mm = 4mm^2

S=6.284=2.28mm2S = 6.28 - 4 = 2.28 mm^2


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