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In the diagram, BEACand BDBF. Find the measures of the following angles.

mCBF

mEBF

mDBE

mDBA

mDBC

x

?

?

?

?

Short Answer

Expert verified

The following table represents the required solution:

mCBF

mEBF

mDBE

mDBA

mDBC

x

90-x

x

90-x

90+x

Step by step solution

01

Step 1. Observe the given information.

As the measurement of angle CBF is already given and the perpendicular relationship between the given lines represents that the measurement of ABE,CBE andDBF is equal to 90°.

02

Step 2. Determine the value of m∠EBF, m∠DBE, m∠DBA and m∠DBC. 

According to the figure EBFand CBFmakes the right EBCso by using this determines the value of EBF.

EBC=EBF+CBF90=EBF+xEBF=90-x

According to the figureEBF andDBE makes the rightDBFso by using this determines the value of DBE.

DBF=EBF+DBE90=90-x+DBEDBE=90-90+xDBE=x

According to the figureDBA andDBE makes the rightABEso by using this determines the value of DBA.

ABE=DBA+DBE90=DBA+xDBA=90-x

According to the figure the rightDBF andCBF makesDBCso by using this determines the value of DBC.

DBC=DBF+CBF=90+x

03

Step 3. Make the complete table.

Make the complete table by writing the value of obtained angles into their respective columns.

mCBF

mEBF

mDBE

mDBA

mDBC

x

90-x

x

90-x

90+x

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