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= 180 -60
= 120 °
b.AED = 180-(BED)
= 180- 120
= 60°
c.DBC = 120 - 30 "(ABC -DBE )"
= 90⁰
d.BDC = 120 - 90 "(ADC-ADB)"
= 30 ⁰
e.ADE = 180 - (60+60) "(180 - (DAE+DEA))"
= 180 - 120
= 60 ⁰
f. BCD = 180 - (BDC + CBD)
= 180 -( 30°+90°)
= 180 - 120
= 60°