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1. How would I solve this? And how would I find the missing angle?
2. (Original post by JackT2000)
How would I solve this? And how would I find the missing angle?
What do you get each of the angles as when y=15 ?
3. (Original post by B_9710)
What do you get each of the angles as when y=15 ?
2(15) + 30
30 + 30 = 60

3(15) + 15
45 + 15 = 60

180 - 120 = 60 - angles in a triangle add up to 180 degrees

Is this right?
4. (Original post by JackT2000)
2(15) + 30
30 + 30 = 60

3(15) + 15
45 + 15 = 60

180 - 120 = 60 - angles in a triangle add up to 180 degrees

Is this right?
Yes. That's all.
5. (Original post by JackT2000)
2(15) + 30
30 + 30 = 60

3(15) + 15
45 + 15 = 60

180 - 120 = 60 - angles in a triangle add up to 180 degrees

Is this right?
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.
6. (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)
7. (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.
8. (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.
9. (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?
10. (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.
11. (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.
The mark scheme doesn't require a statement so I would be awarded 3 marks
12. (Original post by JackT2000)
The mark scheme doesn't require a statement so I would be awarded 3 marks
Is this foundation maths?
13. (Original post by RDKGames)
Is this foundation maths?
Yes it is and I will be sitting the new 9-1 exam next year
14. (Original post by JackT2000)
Yes it is and I will be sitting the new 9-1 exam next year
Oh well that explains it, those don't really need such an explanation so just go ahead with your initial method.

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Updated: August 8, 2016
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