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?
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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 $\displaystyle a^2+b^2=c^2$ where $\displaystyle a,b$ are sides and $\displaystyle c$ is diagonal.
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 $\displaystyle a^2+b^2=c^2$ $\displaystyle 17.2^2+12.9^2=21.5^2$ $\displaystyle 295.84+166.41=462.25$ $\displaystyle 462.25=462.25$ what does that tell you? edit: Air beat me to it!
thanks for the help!!
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