# Circle Theorems Question help

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Thread starter 4 years ago
#1
Hi guys,

My maths GCSE exam is in 4 weeks from now. Ive been revising but i struggle on circle theorems. I was looking for some questions and i came across some questions which ive put in the attachment, i don't remember them exactly as they were so i have made up some of the figures. Please can someone show me how to work these out so that i can practice it.
I will really appreciate any help. This is really important for me to learn and i will be grateful for any working out.
The attachment has 2 questions with it.

Thank you in advance.
0
4 years ago
#2
(Original post by Aty100)
Hi guys,

My maths GCSE exam is in 4 weeks from now. Ive been revising but i struggle on circle theorems. I was looking for some questions and i came across some questions which ive put in the attachment, i don't remember them exactly as they were so i have made up some of the figures. Please can someone show me how to work these out so that i can practice it.
I will really appreciate any help. This is really important for me to learn and i will be grateful for any working out.
The attachment has 2 questions with it.

Thank you in advance.
1. Note that angle ABC=90 degrees (angle in a semi-circle)

2. triangle ABC is isosceles so what is angle ABC ?
angle XBZ=angle ABC (vertically opposite angles.
1
Thread starter 4 years ago
#3
(Original post by brianeverit)
1. Note that angle ABC=90 degrees (angle in a semi-circle)

2. triangle ABC is isosceles so what is angle ABC ?
angle XBZ=angle ABC (vertically opposite angles.

Thank for your help
however im still unsure about the 1st one i understand number 2. For 1 do we use cosine rule to find the length of the diameter?
0
4 years ago
#4
(Original post by Aty100)
Thank for your help
however im still unsure about the 1st one i understand number 2. For 1 do we use cosine rule to find the length of the diameter?
No. Pythagoras. ABC is a right angled triangle.
0
Thread starter 4 years ago
#5
oh of course sorry, not feeling to well, cant think straight

But thanks so much for your help, dearly appreciated
0
Thread starter 4 years ago
#6
heres the attachment with the actual questions sorry. Thanks once again for your time and help.
0
Thread starter 4 years ago
#7
(Original post by brianeverit)
No. Pythagoras. ABC is a right angled triangle.

sorry i added a new attachment with the questions, will the answers be

a) 2 root 41
b) 41 pi
0
4 years ago
#8
(Original post by Aty100)
Hi guys,

My maths GCSE exam is in 4 weeks from now. Ive been revising but i struggle on circle theorems. I was looking for some questions and i came across some questions which ive put in the attachment, i don't remember them exactly as they were so i have made up some of the figures. Please can someone show me how to work these out so that i can practice it.
I will really appreciate any help. This is really important for me to learn and i will be grateful for any working out.
The attachment has 2 questions with it.

Thank you in advance.
You should use Mathswatch and go on GCSE maths takeaway.com
0
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