P5 ratio, heuristics G&C, area diag (fr pcs pp)

P5 P6 Ratio / model (fr pcs PP )

P5 fractions ( fr Chloe Ng )

P6 circles (fr pcs pp)

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Haha... in case you are wondering  if the area of the circle in the centre is indeed the size of “1 leaf” shape, the answer is they are not exactly the same. They are just pretty close.

Here’s a proof that shows the leaf is 0.57R2, whereas the circle in the centre is 0.54R2.

https://drive.google.com/open?id=1EVa4HsoyHGoYUCQyopqSKgwgVg9tYTaO

In any case, to solve the original question, there is no need to prove that.

Given in the question that the centre circle is 1/5 the total shaded area, 

we can infer that the circle has the same area as 1 leaf.

P6 Ratio (fr pcs pp)

P5, P6 pattern (fr targeting math ws Ps)

P5 p6 when are zeroes significant?

P5 P6 Numbers, heuristic: work backwards (fr SherylTan)

P6 circles (fr PCS PP)

P5 fractions. Common error

P5 fraction. Common error

P5 fraction. Common error.

P5 p6 estimation (Fr TM)

P5 P6 order of operation (fr TM)

P6 percentage (fr ACS ppr)

P6 Numbers, money, H: area diag (psle, CSE)

Exploration of height and base of triangles

Sharing my new creation with Geogebra... https://ggbm.at/r5Bhg59s
Have fun exploring heights and bases of a triangle! Suggested activities:

• Observe that the triangle is made up of 3 lines: red, green and blue, hence it will have 3 possible bases.
• Observe that the triangle is an acute triangle.
• Slowly move Point B up and down, as you are doing so...
• What do you notice about the 3 heights (red, green and blue dotted lines)?
• They all "drop" from the apex perpendicularly "down" to their respective bases
• They intersect one another.
• Observe when the green and blue heights seem to "disappear' into blue and green bases

P5 Numbers, conditional (fr Chloe Ng)

P6 numbers, money, area diagram (PCS remedial)