SOLUTION: if ray ACFG and ray BCDE intersect at C and angle ADC is conngruent to angle BFC, then angle ADE is congruent to angle BFG.

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Question 512636: if ray ACFG and ray BCDE intersect at C and angle ADC is conngruent to angle BFC, then angle ADE is congruent to angle BFG.

Answer by solver91311(24713)   (Show Source): You can put this solution on YOUR website!


ADC and ADE are a linear pair and are therefore supplementary (the sum of their measures is 180). Same relationship for BFC and BFG.

So mADC + mADE = 180

mBFC + mBFG = 180

Hence mADC + mADE = mBFC + mBFG

But we are given that mADC = mBFC, so substitute:

mBFC + mADE = mBFC + mBFG

Subtract mBFC from both sides

mADE = mBFG : Q.E.D.

John

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