Shaped graph useful to a baker? (3,5)

I believe the answer is:

pie chart

I'm a little stuck... Click here to teach me more about this clue!

'shaped graph' is the definition.
'pie chart' can be an answer for 'graph' (I've seen this before). I am unsure of the 'shaped' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pie chart that I've seen before include "Illustration of shares" , "Graph of a circle divided into sectors" , "Display of data r" , "Display of information" , "Circle divided by radii to depict percentages of the whole" .)

I've seen this clue in The Daily Express.

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