# Gcse maths trigonometry

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#1
Will someone help me with this maths question please. Give me a step by step guide. Thank you Molly
0
2 years ago
#2
1. Use pythagoras theorem to find the length of side ZX.

So ZX = the square root of (22.3 squared - 7.5 squared)

2. Then you want to use cosine rule to find the angle, as if you have the length of all 3 sides you can find any angle.

When using cosine rule make sure you sub in the correct values in place of the letters, if you get what i mean. Eg a=7.5 as the angle you are finding is YZX and 7.5 is opposite to this angle.

sorry if that doesn’t make sense, it’s kind of difficult to write without the mathmatical symbols🤣
0
2 years ago
#3
(Original post by MollyNelson)
Will someone help me with this maths question please. Give me a step by step guide. Thank you Molly
SOHCAHTOA
7.5 is Opposite the angle you're trying to find, 22.3 is the Hypotenuse.
O and H means use the formula sin(angle) = O/H
Use "Inverse sin" to get the angle!
2
2 years ago
#4
(Original post by e2002!)
1. Use pythagoras theorem to find the length of side ZX.

So ZX = the square root of (22.3 squared - 7.5 squared)

2. Then you want to use cosine rule to find the angle, as if you have the length of all 3 sides you can find any angle.

When using cosine rule make sure you sub in the correct values in place of the letters, if you get what i mean. Eg a=7.5 as the angle you are finding is YZX and 7.5 is opposite to this angle.

sorry if that doesn’t make sense, it’s kind of difficult to write without the mathmatical symbols🤣
That would work but it seems like the long way round. You did see it’s a right angle?
0
2 years ago
#5
(Original post by Dancer2001)
That would work but it seems like the long way round. You did see it’s a right angle?
oh my god ofcourse, my bad🤣Too used to A level maths at this point, clearly over complicating it😭
0
#6
(Original post by vc94)
SOHCAHTOA
7.5 is Opposite the angle you're trying to find, 22.3 is the Hypotenuse.
O and H means use the formula sin(angle) = O/H
Use "Inverse sin" to get the angle
This worked thank you 👍🏼
0
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