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OpenStudy (anonymous):
In trapezoid ABCD, find m∠A if m∠B= 25°, m∠C = 155° and m∠ D= 117°.
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OpenStudy (saifoo.khan):
Use the formula for total internal angle.
OpenStudy (lilai3):
what is the equation?
OpenStudy (lilai3):
if you know the equation, then you'rll be able to solve for angle A.
OpenStudy (anonymous):
ty i found it
OpenStudy (saifoo.khan):
Cheers! :D
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OpenStudy (lilai3):
good job, jazzy! and thanks for the medal :D
OpenStudy (anonymous):
np
hero (hero):
In general, the angles of a quadrilateral add to 360 degrees.
hero (hero):
Therefore m∠A + m∠B + m∠C + m∠D = 360°
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