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AveGali [126]
3 years ago
5

I really need this! Thanks

Mathematics
1 answer:
Anon25 [30]3 years ago
5 0
Triangle ABC is isosceles (even tho' it doesn't look so).

m<BDE = m<BED because of that.

Thus, 66 degrees + 2 m<BDE = 180 degrees, and

2 m<BDE = 114 degrees.  Thus, m<BDE = 57 degrees.
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