Question

Letters a, b, c, and d are angle measures. Which should equal 105° to prove that f ∥ g?

abc d

Answer 1

your answer is d on edge.

Answer 2

we know that

If lines f and g are parallel

then

the angle c must be equal to

∠c=
`75\°` ------> by alternate exterior angles

and

∠c+∠d=
`180\°` ------> by supplementary angles

so

∠d=
`105\°`

therefore

the answer is

The angle d should be equal to
`105\°` to prove that f ∥ g