K16
- Hi
- Hello!
- How can I help you today?
- can u help me with this qn?
- Sure
- The 3 triangles are equilateral triangles, find length AB
- Any other information to share?
- no
- Ok, let me take a look at this question.
- Oh, this is a tricky question. Let me guide you step-by-step.
- ok
- Refer to the diagram below instead
- so, to make the explanation easier
- I have labelled all the points on the triangle.
- ok
- For a start
- Let's compare AC and DG
- Let's compare AC and DH
- What can you tell from these 2 length?
- they are equal?
- Actually the 2 lengths are equal.
- Yes, you are right.
- But why are they equal?
- You can see that CD is the part that is overlapping
- So this tells us that DH = 18 cm as well :)
- so like if u flip the triangle DH is like AC
- Yes! That's right!
- Next, we need to find the length HJ
- I highlighted it in orange
- so is just 41-18?
- Yes! That's correct.
So we find the length of HJ, which is 23 cm. 
- From the information we found, i have updated the image here :)
- ohhh i got it
- Do you know how to find the length of AB?
- AB = GJ = 23+3 = 26cm
- right?
- Well done!
- yay!
- That's the correct answer :)
- i have another qn with the same diagram tho
- ?
- can u help?
- What's your question?
- i need to find the perimeter of the shaded areas
- That's easy. You might not need my help on that ;)
- Let me give you a clue
- Find the length of CD
- Since it is an equilateral triangle
- 26-18?
- Bingo!
- That's 6 cm
- 8 cm
- Not 6 cm, my bad on that :)
- but CE is also 8?
- or the small triangles are not equal?
- yes, CE is also 8 cm
- the small triangles are also equilateral triangles
- oh
- Look at this diagram here
- i got it
- Add up the sides of the shaded parts and you should get the answer :)
- What's your answer?
- Did you get 145 cm?
- yes
- Well done!
- Hope I managed to help you understand how to solve the question
- I will see you around
- Goodbye!!
- thank you
- byebye
Session ended by mentor.
Adeline Lee, 
