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nadezda [96]
3 years ago
8

Pls help and explain how gladly help full

Mathematics
1 answer:
seropon [69]3 years ago
3 0
Well, the formula for a triangle is base times height times 1/2. In this case it would be 21x30. That equals 630. Then, you divide 630 by 2 which is 315. Your answer would be 315 squared.
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