7/12 x 5

Any prob in finding length of these colours?

Does 7m refer to the red curve?

yup

For area, find area of rectangle, minus rea of green quadrants and red parts

How to find area of red parts?

Area of sqr minus area of quadrant

But what is the radius of that quadrant, since 7m is the curved part

7cm is the circumference of a quarter of a circle. Using this, find the radius, hence the shaded part.

I cant get the radius. Can show me the working pls?

2 x r x 22/7 x 1/4 = 7 How would you get r then?

r x 11/4 = 7 r = 28/11 Area of 2 green quad = r^2 x 22/7 x 1/2 = (28/11)^2 x 22/7 x 1/2

Thank u

Follow. I can find out the cost of A, B, C. However, the "units" in A that i have in the model does not necessary equal to the "packets". Looking forward to see some enlightenment from the teachers.

Mind taking pictures in the correct orientation next time? Thanks.

Thank u

Raymond Ng, where u get 8 to multiple and plus 4 ? thanks

Look at the even rows: Row2: 8 = 8 × 1^2 Row4: 32 = 8 × 2^2 Row6: 72 = 8 × 3^2 See the pattern? As for the +4, it is used to account for the 4 protruding tiles.

Oh Isee。thanks

hw about plus 4?

As for the +4, it is used to account for the 4 protruding tiles.

Raymond, is there a formula for this qn?

I have come across heuristic qn like this but it has formula to solve.

Yup there is. But it's kind of hard to explain in typing... For such questions, I usually coach my students in a lesson or 2. Then, I would test them to come up with the general term for a few questions. If they take more than 1min, I'll increase the number of questions they have to do in front of me until they can come up with the general term within the 1 min (which I'll time them with my timer app). Haha... a bit sadistic I know... but most of the time, I won't succeed as most of them managed to grasp the various techniques within the lesson. I used the same training for them on those questions involving ratios between A, B, C, D (if you know which type of question I'm talking about). They are to balance the ratios within a specified timing. Such thinking/methodology have been beneficial for my past & existing students who had/have gone on to IP schools like NUSH & RGS among others, which have modules called Alternative Assessments or Problem Solving which rely largely on such heuristics problem solving strategies. Many parents in this & other forums have tried asking me how I know must ×2 here, x3 there to balance the ratio. I tried to explain in words, some figured it out, some didn't. It's very hard for me to explain clearly in words over the forum, unlike one-on-one coaching with my students whereby I can impart the various skills to them face-to-face. Hope to have your (& their) understanding.

what does this ^ stand for?

To the power of. Eg 3^2 = 3×3=9

I studied at your working but still dnt understand how u get the answers for part b n c..

Ok. Let me try my best to explain in words again. b) Look at the even rows: Row2: 8 = 8 × 1^2 Row4: 32 = 8 × 2^2 Row6: 72 = 8 × 3^2 ... Row30: __ = 8 × ?^2 (fill in the ?) c) Row1: 5 = (2×1-1)^2+4 Row2: 13 = (2×2-1)^2+4 Row3: 29 = (2×3-1)^2+4 ... Row86: __= (2×?-1)^2+4 (fill in the ?)