Answer:
4a=76°
2a=38°
X=104°
Explanation:
the sum of angles triangle are 180°
so,
66°+4a+2a= 180°
or, 66°+6a=180°
or,6a= 180°-66°
or, a= 114°÷6
or, a= 19°
then, angle B = 4a= 4xa= 4x19°= 76°
angle C = 2x19°= 38°
lastly,
4a+x=180°[being straight angle]
76°+x=180°
x= 180°-76°
x= 104°.