For part 3(3).
Firstly we should convert this problem into a brief expression, which is easy to do.
So we know that
And the key point is to how to connect the first sentence to the second sentence.
In other words, what does it mean? Think for a while.
Usually a picture will usually help us understand the problem because sometimes visualizing is more powerful than simply struggling with algebra.
we call this 4 circles A, B, C, D (from left to right, up to down).
Convert what we’ve known again.
If we have A then we have B; if we have C, then we have D. But how to get if we have A, then we have D?
The problem now is how to link B to C.
If the circle B is smaller than C, can we link them successfully?
And what does it mean by the area of B is smaller than C?