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il63 [147K]
3 years ago
7

Please Help!!! Parallelograms

Mathematics
2 answers:
laila [671]3 years ago
8 0

Answer:

125

Step-by-step explanation:

AB || DC

Thus mCDA and mDAB is co-interior angles,

i.e. their sum equals 180°

larisa [96]3 years ago
3 0

For this case we have to:

AB is parallel to DC

AD is parallel BC

So the angles DAB and DCB are equal. And the angles CDA and ABC are the same too (55 each)

The sum of the internal angles of a parallelogram is 360 degrees.

55 + 55 + 2DAB = 360\\110 + 2DAB = 360\\DAB = \frac {360-110} {2}\\DAB = 125

Answer:

125

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