You're right but it doesn't explain why the triangle is equilateral. Look up the definition of an equilateral triangle and apply it to your question. You need a succinct statement showing that it is that type of triangle.

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Original post by RDKGames

You're right but it doesn't explain why the triangle is equilateral. Look up the definition of an equilateral triangle and apply it to your question. You need a succinct statement showing that it is that type of triangle.

Ok but the question only asks you to show using y=15?

I know it already an equilateral triangle has 3 equal sides and angles (each angle being 60 degrees)

Original post by JackT2000

Ok but the question only asks you to show using y=15?

I know it already an equilateral triangle has 3 equal sides and angles (each angle being 60 degrees)

It's good that you know, so show that to the examiner or whoever marks your paper by stating that: when y=15, all angles are 60 degrees therefore forming an equilateral triangle. Or some statement similar to that.

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Original post by JackT2000

Ok but the question only asks you to show using y=15?

I know it already an equilateral triangle has 3 equal sides and angles (each angle being 60 degrees)

It would just be best to include a statement that says that 3 equal angles implies three equal side lengths. It's obvious but you know what the examiners are like.

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Original post by RDKGames

It's good that you know, so show that to the examiner or whoever marks your paper by stating that: when y=15, all angles are 60 degrees therefore forming an equilateral triangle. Or some statement similar to that.

So would just stating that an equilateral triangle has 3 equal angles being 60 degrees and 3 equal sides be enough?

And I don't gain or lose marks for this statement do I?

Original post by JackT2000

So would just stating that an equilateral triangle has 3 equal angles being 60 degrees and 3 equal sides be enough?

And I don't gain or lose marks for this statement do I?

You would be simply be stating something from a book without any application to the question, so personally I wouldn't award you full marks for that.

If you want full marks on that question, go along with your explanation then show mathematically that when y=15, each angle is 60 degrees. This would prove it is equilateral.

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Original post by RDKGames

You would be simply be stating something from a book without any application to the question, so personally I wouldn't award you full marks for that.

If you want full marks on that question, go along with your explanation then show mathematically that when y=15, each angle is 60 degrees. This would prove it is equilateral.