area of composite figure (pt2)

• solve this

  20 - 12 = 8

  A = length x width or lw A = base x height divided by 2

  • 12 x 10 - 8 x 10 divided by 2
  • 120 cm - 40 cm

  add

  120 + 40 = 160 cm

  
• step 1 on how to solve

  separate
• step 3 on how to solve

  after separating, subtract the separated area from the other area (??)
• step 2 on how to solve

  find out the shapes included in the figure
• step 4 on how to solve

  multiply the given numbers on the shapes
• step 5 on how to solve

  add the multiplied numbers
• example :

  as you can see, the subtracted numbers were multiplied the by the other number that is not involved