which lines are parallel? justify your answer.
lines a and b are parallel because their alternate exterior angles are congruent.
lines a and b are parallel because their same side exterior angles are supplementary.
lines e and f are parallel because their alternate exterior angles are congruent.
lines e and f are parallel because their same side exterior angles are congruent.
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How do i do this? i don’t understand

The median am of triangle ∆abc is half the length of the side towards which it is drawn, bc . prove that triangle ∆abc is a right triangle, and find angle mac and abm

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?