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Fine the measurements of ABE

Fine the measurements of ABE-example-1
User Esamatti
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Explanation:

ABC and CBD are SUPPLEMENTARY.

...they form a straight line = 180 degrees

So 80x + 21 + 80 - x = 180 <===== solve for 'x'

79x = 79

x = 1

Now, ABE and CBD are opposite vertical angles and are therefore equal

CBD = 80 - x = 80 -1 = 79 degrees

so ABE = 79 degrees too

User Pierre Poliakoff
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