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Geometry ConceptsPerpendicular Lines: Two lines that intersect ata 90 degree angle.PerimeterRectangle: Add all sides together. The answerbelow is 18.Triangle: multiply the base, height,and 1/2 together. The answer belowis 6. (1/2(4*3)=6)Parallel Lines: Two lines that never meet and arethe same distance apart.Triangle: Add all sides together. The answerbelow is 28 cm.Circle: Pi times radius ^2. The answer belowis 25pi.Intersecting Lines: Two lines that cross.AreaRectangle: Length times Width. Theanswer below is 21.Skewed Lines: Various Lines that do not intersect.Resourcesicoachmath.commathatube.comIntersectinglines1.gifline05.pngicoachmath.commathatube.comgamesforkidsonlinefree.netmrlsmath.com