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1.c.
2.a. RQ=40°
b. AB=100°
c. AB=20°
d. ZQ=ZR=20°
e. ZC=40°
BC=60°.
3.let the angles be 3x, 1x,2x
3x+x+2x = 180°
6x = 180°
x = 180°/6
x = 30°.
3x=3×30=90°.
1x=1x30=30°.
2x=2×30=60°.
4.3x+2x+5x=180°.(Sum of triangle property)
Similar as question number 3.
b.Similar as question number 3.()
c.Similar as question number 3.(Sum of triangle property)
d.3x+2x=90°.(Right angle object.
5.70°+5x+6x=180°.[Sum of triangle property}.
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