How to measure an Area in Analysis Photoshop cc-14?

How to measure an Area in Analysis Photoshop cc-14?
PS's online help only mentions to use the Ruler to measure a straight.
The are many of capabilities, but I cannot figure it out.
I have searched all of Photoshop's tutorials, but Help is the best.
All the online tutorials on show the rudiments of Analysis.
Thank you for any info...
Bob

Photoshop Help | Measurement (Photoshop Extended)
In the help there I see
Create a selection area to measure values such as height, width, perimeter, area, and pixel gray values. You can measure one selection or several selections at once.

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Greg Date: Wed, 13 Jun 2012 16:46:55 -0600
From: [email protected]
To: [email protected]
Subject: How are pictures in Photoshop elements 9 linked to program?
    Re: How are pictures in Photoshop elements 9 linked to program?
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