1.

L_1 and L_2" are two intersecting lines. If the image of " L_1 " w.r.t. " L_2 " and that of " L_2 " w.r.t. " L_1 " concide, then the angle between " L_1 and L_2is

Answer»

`20^@`
`15^@`
`45^@`
`60^@`

ANSWER :B


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