HI Bob,
Haven't checked if this feature is available in Pages for iOS, but it has been standard since the beginning in Pages for Mac.
Example below is in Pages 5.6.2.
Select the paragraphs to which the hanging indent will apply.
Go to the View menu, and choose Show Rulers.
In the ruler look to the left end to find the two part icon combining a Left Margin stop (downward pointing triangle) and a First Line left margin stop (thin rectangle sitting on the triangle).
Click on the triangle part and drag right to where you want the main left margin of the text to be.
Click on the rectangle part and drag left to the document margin.
Done.
Alternate method:
Select the paragraph(s) to which you want to apply hanging indents.
Open the Format inspector by clicking the Format Brush.
Set the first line and left values in the Indents section to the values you want.
(the ones shown are the result of my setting the hanging indent by dragging the icons on the ruler. Results of setting by entering numbers in the controls in the inspector can be more precise.
Regards,
Barry