U Proving the Parallelogram Side Theorem

Given: ABCD is a parallelogram.

Prove: AB CD and BC DA

Angles Segments Triangles Statements

Reasons

given

def of parallelogram

unique line postulate

def. of alt interior angles

Statements

Reasons

Demo

Intro

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

Solve the system. -a+4b+2c=-8 3a+b-4c=9 b=-1 a.(0,11) ,-1,2) c.(1,1,-2) d.(2,-1,-1)

Can someone me with this problem . show your work .