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December 19, 2014

December 19, 2014

Posted by **ganga** on Tuesday, February 5, 2013 at 5:45am.

- maths -
**Reiny**, Tuesday, February 5, 2013 at 8:55amDid you make your sketch?

let angle A be 2x

let angle D be 2y

because of the parallel lines,

2x + 2y = 190

x + y = 90

after bisection of angle A and D

look at triangle AOD

we have x + y + angle AOD = 180

90 + angle AOD = 180

angle AOD = 90°

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