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