Question

Geometry: Write a formal proof, ASAP!!!

Answer 1

`{\qquad\qquad\huge\underline{{\sf Answer}}}`

Here we go ~

As we can see in the figure, lines m and n are parallel to each other. so we can apply Angle pair properties ~

So,

`\qquad \sf  \dashrightarrow \: \angle1 \cong \angle2`

[ they form corresponding angle pair ]

and it's given that :

`\qquad \sf  \dashrightarrow \: \angle2 \cong\angle 3`

therefore, by using above information. we can conclude that :

`\qquad \sf  \dashrightarrow \: \angle1 \cong \angle3`