The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Math Topics » geometry.pre-college

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: i cant figure these out... if someone could PLEASE help thatd be great!?
Replies: 3   Last Post: Jul 31, 2008 10:57 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]

Posts: 52
Registered: 12/4/04
Re: i cant figure these out... if someone could PLEASE help thatd
be great!?

Posted: Nov 26, 2003 7:49 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply


I hope you don't mind that I'm just going to give you some hints.

>1. If ON=4x-5, LM=2x+4, NM=x+5, and OL=8y-7, find the values of x and
>y given that LMNO is a parallelogram.
>a)x=-1/2;y= 23/16

For this and #3, the key property of parallelograms to consider is
that opposite sides have equal length.

>2.Consider the statement, "if a parallelogram is a square,then it is a
>a)decide whether it is true or false.
>b)Write a converse
>c)decide whether the converse is true or false.

For part a), if you can understand why, for example, all squares are
rectangles (because squares satisfy all of the conditions for being a
rectangle), but not all rectangles are squares, you can answer this.
For parts b) and c), start by looking up "converse." The converse
here will start with "If a parallelogram is a rhombus, . . . "

>3.draw figure in a coordinate plane and write a coordinate proof
>Given: Quadrilateral ABCD with A (-5,0), B (3,-1) C(6,1), D(-2,2)
>Prove: ABCD is a parallelogram
>i drew the figure but i dont know how to do the rest of that one.. and
>the other 2 i dont understand how to do.. if someone could please help
>me with these thatd be great.. thanks.

Here you can use my hint from 1) along with the Distance Formula, or
recall that parallelograms have two pairs of parallel sides and use
the formula for slope.

I hope this helps!

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.