Question

Cine ma ajuta si pe mine dau coroana ex 12

Answer 1

notam trapezul ABCD
m(∡DCB)=m(∡CBA)=x
m(∡ADC)=m(∡BCD)=y
x/2=y/7 =(x+y)/(2+7)=180°/9=20°
y=180°-20°=160°
m(∡DCB)=m(∡CBA)=x=20°
m(∡ADC)=m(∡BCD)=y=160°