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question 4
x+50+130+12=360
x=360-192
question 5
x +90= 180. (linear pair )
x=90
z+30=180 (linear equation)
z=150
x+y+z=180 ( exterior angles)
y=
x
Step-by-step explanation:
Q. 4
we know all angles of a quadilateral =360°
so
50+130+12+x=360
=192+x=360
x=360-192
x=168 ans.
Q. 5
30+90+x=180
120+x=180
=x=60
z=30
x=180-90=90(as a straight line makes a 180 angle)
y=180-60=120 (as a straight line makes a 180 angle)
x+y+z=30+90+120=240
Q. 6 50/10=5/1=5:1
5/0.5= 10:1
Q. 7 (I) 3*100/4 =300/4=75%
ii 2*100/3 =66 2/3