If angle BDC is -3+20° and CDA is -2x+55° then the angle BDC will be 29°.
Given that angle BDC is -3+20° and CDA is -2x+55°.
We are required to find the angle BDC.
Angle is basically degree of inclination of something on the surface.
From the given figure we can say that the sum of angle BDC and angle CDA is equal to 90 degrees.
Angle BDC+Angle CDA=90
We have to put the respective expressions in the above equation.
-3x+20-2x+55=90
-5x+75=90
-5x=90-75
-5x=15
x=-3
BDC=-3x+20
=-3*(-3)+20
=9+20
=29°
Hence if angle BDC is -3+20° and CDA is -2x+55° then the angle BDC will be 29°.
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