3 years ago

Quadrilateral abcd is inscribed in this circle. what is the measure of angle a?

1 answer:

8 0

Look at the picture.

$(x+2)+(3x+6)=180\\\\4x+8=180\ \ \ \ |-8\\\\4x=172\ \ \ \ |:4\\\\x=43$

$m\angle A=(3\cdot43+6)^o=135^o$

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