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Because the 2 quadrants A and B are identical, that means
- the blue segments are the same length;
- they are at right angle to each other;
- so bottom left part is a square.
Thus blue segment is 35cm and big quadrant has radius 70cm.

The above reasoning is quite important because they said
explicitly that it is now drawn to scale so we cannot just
"guess" it is a square and its length is half the radius.



Once that is done, cut the leaf at bottom left and shift them
by following the arrow. We now have a quadrant minus a triangle.

So area is pi * 70 * 70 / 4 - 70 * 70 / 2 = 1396.5 cm2.
1 Reply 2 Likes ✔Accepted Answer

Wow… I never thought of shifting the segments up to make a proper quadrant!

It makes the problem so much easier.  Thanks!

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