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I cant understand the lettera

I cant understand the lettera-example-1

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Answer: The letters ABC are the ones you're trying to find. ABD we are given which is 40, and DBC is 90, you can tell it's 90 by the square in the corner. What you add 40 and 90 together to make ABC's measurement, which would end up being 130, or D.

User Jakub Lortz
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