3. a) < ACD + < DCB = 180°
( 4p - 7 )° + ( 2p - 23 )° = 180°
( 6p - 30 )° = 180°
6p = 180° + 30°
6p = 210°
p = 35°
b) < ACD = ( 4p - 7 )°
= ( 4.35 - 7 )°
= ( 140 - 7 )°
= 133°
c) < DCB = ( 2p - 23 )°
= ( 2.35 - 23 )°
= ( 70 - 23 )°
= 47°
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3. a) < ACD + < DCB = 180°
( 4p - 7 )° + ( 2p - 23 )° = 180°
( 6p - 30 )° = 180°
6p = 180° + 30°
6p = 210°
p = 35°
b) < ACD = ( 4p - 7 )°
= ( 4.35 - 7 )°
= ( 140 - 7 )°
= 133°
c) < DCB = ( 2p - 23 )°
= ( 2.35 - 23 )°
= ( 70 - 23 )°
= 47°