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Can someone explain how to get each answer for number 9

This is to study for a test. The test is tmrw! :(

Can someone explain how to get each answer for number 9 This is to study for a test-example-1
User AaronS
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2 Answers

4 votes
Area 425 cm ( answer b)
User TownCube
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the answer is b: area 425 cm
User Teamg
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