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TRANSCRIPT
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A.Same Value
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Chapter 1
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B.Corresponding Angles
C.Alternate Angles
C.Interior Angles
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D.Special Angel For (M W )
< 1 = 180-110 < 2 = 85-70
=70 = 15
x+15=180
x=180-15 =165
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E.Example
x=47 ( alternate angles) < 1 = 180 - 112 - 47
= 21
y= 180 - 47 - 21
=112
2x=68 (alternate angles ) < 1 = 30 (alternate angles )
x=34 y+< 1 =180
y=180-30
= 150
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< 1 = 48
75+x+ < 1= 180 (interior angles)
x = 180 - 75 - 48
= 57
< 1 = 360 - 260 < 2 = 100
=100 (corr.angles)
x=100( alternate angles) 70+100+y = 180
y=10
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Chapter 2
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Sides of a regular polygon=
360/ exterior
Exterior angle of a regular polygon=
360/n ( n= no.of the polygon )
C.Important otes
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interior angle + exterior angle = 180
Su of the exterior angles = 360
a! " ! # ! d !e are exterior angles
a+"+#+d+e = 360
D.Examples
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$ind the su of interior of heptagon.
(n-2)180
=(7-2)180
=00
$ind the si%e of an interior of de#agon.
(10-2)180 1440!10
=1440 =144
$ind the sides of the polygon &hose su of
interior is 1'60
(n-2)180=1260
(n-2)= 7
n=
ien that the exterior of a regular polygon is
30.$ind the sides of the polygon.
n = 360!30
= 12
E.Find angles
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(5-2)180 = 540
5x+2+3x+5+5x+10+4x+15+8x+8=540
25x + 40 = 540
25x= 500
x=20
F.Special !or $egular pol#gon
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