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3 years ago

If mZDEC = (12x - 3), mZBCE =

Mathematics

1 answer:

kati45 [8]3 years ago

3 0

Answer:

Step-by-step explanation:

12x - 3 = 180 - (7x - 26) supplementary angles

19x = 209

x = 11

m∠DEC = 12(11) - 3 = 129°

m∠BCE = 7(11) - 26 = 51°

M∠ADE = 129 - 72 = 57° exterior angle rule

m∠EDB = 180 - 57 = 123° supplementary angles

m∠DBC = 57° corresponding angle to ADE

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Step-by-step explanation:

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Step-by-step explanation:

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