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Math Help - geometry problem

  1. #1
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    Exclamation 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?
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  2. #2
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    Quote Originally Posted by scoobydoo View Post
    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.
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  3. #3
    Member TheMasterMind's Avatar
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    Quote Originally Posted by scoobydoo View Post
    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!
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  4. #4
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    Smile

    thanks for the help!!
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