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I NEED THE ANSER TO NUMBER 9 And 11

I NEED THE ANSER TO NUMBER 9 And 11 class=

Answer :

ISSAHARUN10GO

Answer:1. the 1 one do a half base×height ( 1/2 × 9×17).

2. the second one do 15 ×18 and 20×9 then subtract the2 answers

=15×8=270 20×9=180 270-180=90.

=90

please mark me the brainlest.

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