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Area of Blue Triangle = 1/2 of rectangle = 1/2 x 600 = 300 sq cm

Area of Yellow Triangle = Area of Green Triangle = Area of Blue Triangle = 300 sq cm (because they all share the same base BC and perpendicular height BA)

Since overlap Y is the same area within both Yellow and Green triangles, means the two black triangles are of the same area. Each area is 150/2=75 sq cm

Unshaded part Y = 300-75 = 225 sq cm#

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