geometry problem

**scoobydoo** · January 5th 2009, 01:54 PM

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?

**Simplicity** · January 5th 2009, 01:57 PM

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.

**TheMasterMind** · January 5th 2009, 01:59 PM

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?