12 in.
11 in.
17 in.
16 in. -

  16. 216 square inches

  18. 252 square cm

Step-by-step explanation:

16. The figure can be decomposed into a 12×17 rectangle and a triangle with base 16-12=4 and height 17-11=6.

Then the area is ...

  rectangle area = 12×17 = 204

  triangle area = (1/2)(4×6) = 12

  total area = rectangle area + triangle area = 204 +12 = 216 . . . square inches

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18. The figure can be decomposed into a 12×12 square and a 18×6 rectangle. Then the total area is ...

  area = 12×12 + 18×6 = 252 . . . square cm

you need to show the graph

step-by-step explanation:

answer by yourhope:

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: )