presley9
presley9
11-06-2017
Mathematics
contestada
Find measure of angle BDC
Respuesta :
3mar
3mar
11-06-2017
The measure of the whole angle is 90 degree
so that:
m(BDC) + m(CDA) = 90
-3x + 20 - 2x + 55 = 90
solving for x:
-5x + 75 = 90
-5x = 90 - 75 = 15
x=-3
and therefore
m(BDC) = -3x + 20 = -3*-5 + 20 = 15 + 20 = 35 degree
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