erighhere erighhere

21-05-2018
Mathematics

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Secants BE and CF intersect at point D inside A. What is the measure of CDE?

Secants BE and CF intersect at point D inside A What is the measure of CDE class=

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choixongdong choixongdong

21-05-2018

mCE = 360 - (150 + 70 + 50)
mCE = 360 - 270
mCE = 90

<CDE = 1/2(mBE + mCE)
<CDE = 1/2(150 + 90)
<CDE = 1/2(240)
<CDE = 120

answer
<CDE = 120°

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