Perimeter/Area: Parallelograms

  • In general, to find the PERIMETER of a polygon you add the length of each side
  • In general, to find the AREA of a parallelogram, you multiply the length of the base with the height
  • REMEMBER: the height of a shape is the distance from the bottom of the shape to its tops as a straight line

FORMULAS

1.) PERIMETER: P(name of shape) = s1+s2+s3+s4

s =  SIDE

remember that perimeter is measured in UNITS (i.e. in., cm, ft, m, etc)

2.) AREA: A(name of shape) = bh

b = length of the base

h= height of the shape

remember that area is measured in UNITS2 (i.e. in2, cm2, ft2, m2, etc)

                                            

LOOK AT THE EXAMPLE BELOW, THEN DO THE TASK

 What is the perimeter and area of the parallelogram?

To find the PERIMETER, use the formula....P (parallelogram) = 10 + 8 +10 + 8

Notice that we do not use the measurement 6 in because it is NOT the length of a SIDE

So, P(parallelogram) = 36 in

To find the AREA, use the formula....A(parallelogram) = 10 x 6

Notice that we used 6 in and not 8 in for the HEIGHT....height can never be a SLANTED line segment

So, A(parallelogram) = 60 in2

 

TASK: Find the perimeter and area of rectangles

CLICK HERE