College Math

square is like a rectangle with all sides equal to each other. In a trapezoid , only one pair of opposite sides is parallel to each other. Different quadrilaterals are shown here: Note that the sum total of all the four angles of a quadrilateral is equal to 360 0 . The perimeter of all these quadrilaterals would be the sum of all the sides of the quadrilateral. Area of parallelogram = base*height Area of rectangle = base*height Area of rhombus = base* height Area of square = side 2 Area of trapezoid = ½* (b 1 + b 2 )*h, where b 1 and b 2 are the length of the opposite bases of the trapezoid while h is the height. For instance, find the area of the given quadrilateral. Being a trapezoid, the following formula should be used: Area of trapezoid = ½* (b 1 + b 2 )*h b 1 = 45, b 2 = 121 and h = 20 Area = ½*(45+121)*20 Area = 1660 unit 2 3.3 Parallel and Perpendicular Lines Parallel lines are the lines which never intersect each other. Perpendicular lines are those lines which intersect each other at right angles.

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