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WARRIOR [948]
3 years ago
8

HELP ME PLEASE DB is a diagonal of parallelogram ABCD, what is the measure of ADB

Mathematics
2 answers:
Zielflug [23.3K]3 years ago
4 0

The sum of the measures of the interior angles of a polygon of n sides is

180(n - 2)


A parallelogram has 4 sides, so n = 4.


The sum of the measures of the interior angles of a parallelogram (and all quadrilaterals) is

180(4 - 2) = 180 * 2 = 360


Also, opposite angles of a parallelogram are congruent.


Angles A and C are congruent, so m<A = m<C = 112


m<ADC = m<ABC since they are opposite angles.


m<ADC + m<ABC + m<A + m<C = 360


m<ADC + m<ADC + 112 + 112 = 360


2m<ADC = 136


m<ADC = 68


m<ADB + m<BDC = 68


m<ADB + 27 = 68


m<ADB = 41

mixas84 [53]3 years ago
3 0

m < DAB + m < ADC = 180 (because ABCD is a parallelogram)


so m < ADC = 180 -112 = 68 degrees


Therefore m < ADB = 68 - 27 = 41 degrees (answer)

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