pitnerv14
pitnerv14 pitnerv14
  • 22-08-2017
  • Mathematics
contestada

Can someone help me with 3 a and b?? Thank you

Can someone help me with 3 a and b Thank you class=

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Banabanana
Banabanana Banabanana
  • 22-08-2017
m∠ADB + m∠BDC = m∠ADC   [angle addition postulate]

x + x + 10 = 60 
2x + 10 = 60
2x = 60 - 10
2x = 50
x = 50/2
x = 25

a
m
∠ADB = x = 25°

b 
m∠BDC = x + 10 = 25 + 10 = 35°
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