¢. Given : Line 7 is a transversal of line / and line m. | a 7 Za and Zb is a congruent pair

Alternate angles Test.
¢. Given : Line 7 is a transversal of line / and line m. |
a 7 Za and Zb is a congruent pair of corresponding angles. 4
; That is, Za = Zb i
To prove : line /|| line m ha a
;: Proof : Za+ Zc= 180° ……….angles in linear pair | a
Za=Zb «1… given Ab F
| “. Z2b+ Zc = 180° 4
: | That is a pair of interior angles on the same oe 4
– side of the transversal is congruent. Fig. 2.16%
| . line /|| line m……….interior angles test | oo ag
a ‘ This property is called the corresponding angles test of paralle] iim


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