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Some examples of plane figures are triangles,rectangles,squares,circles,heart,pentagons,and hexagons.A plane figure is flat figure with closed lines that stays in a single plane. The lines of the figure can be straight, curved or a combination 
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Problems involving plane figures:

1)  Area of a triangle
     Solution:  A= (bh)/2

2)  Area of square 
     Solution: Area = (sides)²

3)  Perimeter of rectangle
     Solution:  P (of rectangle) = 2(length) + 2 (width or breadth)
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