Geometry Problem 1521. Post your solution in the comment box below.
Level: Mathematics Education, K-12 School, Honors Geometry, College.
Details: Click on the figure below.
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DBE = 70° (It will be explained on the sketch)
ReplyDeleteLet <QBD = < QDB = p and let < OBE = < OEB = q
ReplyDeleteIn Triangle OQB,
(p+p-40) + (q + q - 40) = 140
So p + q = 220/2 = 110
Hence < DBE = p + q - 40 = 70
Sumith Peiris
Moratuwa
Sri Lanka