# geometry problem

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• Jan 5th 2009, 02:54 PM
scoobydoo
geometry problem
A picture frame has one side of length 17.2cm, a side measuring 12.9cm and a diagonal length of 21.5cm.

is the frame rectangular??

4 marks

Help!! what topic do i use?
• Jan 5th 2009, 02:57 PM
Simplicity
Quote:

Originally Posted by scoobydoo
A picture frame has one side of length 17.2cm, a side measuring 12.9cm and a diagonal length of 21.5cm.

is the frame rectangular??

4 marks

Help!! what topic do i use?

Pythagoras theorem

$a^2+b^2=c^2$ where $a,b$ are sides and $c$ is diagonal.
• Jan 5th 2009, 02:59 PM
TheMasterMind
Quote:

Originally Posted by scoobydoo
A picture frame has one side of length 17.2cm, a side measuring 12.9cm and a diagonal length of 21.5cm.

is the frame rectangular??

4 marks

Help!! what topic do i use?

consider

$a^2+b^2=c^2$

$17.2^2+12.9^2=21.5^2$

$295.84+166.41=462.25$

$462.25=462.25$

what does that tell you?

edit: Air beat me to it!
• Jan 5th 2009, 03:01 PM
scoobydoo
thanks for the help!! :)