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post-16727

 triangle-1

1st triangle above= Base =1 cm, height = 1cm, area  =1/2 x 1 x 1 = 0.5 cm2

triangle-2 2nd triangle, Base  =2cm, height =1cm. Area = 1/2 X 2 X 1 = 1 cm2

 

 triangle-33rd triangle, Base = 2, height= 2, area = 1/2 X 2 X 2 = 2 cm2

triangle-44th triangle = 1/2 X 1 X 1 = 0.5 cm2

rectangle-1 Area of rectangle = 2 X 1 = 2 cm2

Total shaded area = 0.5 + 1 + 2 + 0.5 + 2 = 6 cm2 ##

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