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This Geometry Question Will Likely Be On The CXC/CSEC Exams

In the diagram below, not drawn to scale, O indicates the center of the circle. The lines AD and CE are parallel. Angle DAB = 620; angle ACE = 540.  What is the value of angle ECB?

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neal

Feb 12, 2018
Trudy, because an angle inscribed within a semi circle "diameter" is a right angle or 90 degrees. 90 - 54 = 36

Trudy Ann

Feb 11, 2018
how is it 36

neal

Feb 07, 2018
Yes, it is.

Alesha

Feb 06, 2018
36

neal

Feb 04, 2018
Fazeena, you are correct. An angle inscribed in a semicircle is always a right angle; opposite angels in parallel lines are equal.

Fazeena

Feb 03, 2018
Is it 36?