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# How do I answer C1 questions where by

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1. they give me three co-ordinates of a triangle and tell me to work out the area but you don't know the height of the triangle since the base doesn't make a straight line
2. Work out the length of each of the sides using Pythagoras, then use the cosine rule to work out one of the angles
then use the formula area= 1/2 a b sin(c)
3. (Original post by DedeM9)
they give me three co-ordinates of a triangle and tell me to work out the area but you don't know the height of the triangle since the base doesn't make a straight line
Give me the picture of the question since you're not being specific with the details here... -.-
4. (Original post by Radical Lemon)
Work out the length of each of the sides using Pythagoras, then use the cosine rule to work out one of the angles
then use the formula area= 1/2 a b sin(c)
You don't need to know that for C1??
5. (Original post by Radical Lemon)
Work out the length of each of the sides using Pythagoras, then use the cosine rule to work out one of the angles
then use the formula area= 1/2 a b sin(c)
Im pretty sure if it's C1 it'll be the basic 1/2*base*height?
6. (Original post by zayn008)
Im pretty sure if it's C1 it'll be the basic 1/2*base*height?
Yup I think in C1 there's always a perpendicular angle.
7. AH! You use the mid point of the base and the top co-ordinate to work out the height!!!!!
8. (Original post by XOR_)
Yup I think in C1 there's always a perpendicular angle.
Yeah usually they build it up, so I bet before this question they asked to show 2 lines are perpendicular, that or you can use the base mid points and the top co-ordinate to get the length of the height
9. (Original post by zayn008)
Im pretty sure if it's C1 it'll be the basic 1/2*base*height?
I believe this is correct.
Remember it is base times PERPENDICULAR (vertical) height, not the slanted height.
(Original post by Zacken)
It's usually referred to as the perpendicular height.
10. (Original post by zayn008)
AH! You use the mid point of the base and the top co-ordinate to work out the height!!!!!
Do you have an example questions?
I believe this is correct.
Remember it is base times VERTICAL height, not the slanted height.
Doing past papers... and those are the only questions I've found.
I believe this is correct.
Remember it is base times VERTICAL height, not the slanted height.
It's usually referred to as the perpendicular height.
13. (Original post by Zacken)
It's usually referred to as the perpendicular height.
Sorry...still a bit of a maths noob I'll quote you in.
Sorry...still a bit of a maths noob I'll quote you in.
You weren't wrong at all, nothing nooby about it. Was just a quick tip.

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