Your chart size is too small for this font size.
One option is to change the property fontSize. This is the default font size. This will affect everything.
Another is a fontSizeproperty change pieSliceTextStyle. For example:
var options = {
title: 'Chart Title',
pieHole: 0.4,
pieSliceTextStyle: {
fontSize: 7
}
};
Choose the font size that suits you.
See google docs for chart configuration options
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