How to Prove Thales’s Theorem
<p>Now draw a line — its length equal to the diameter of the circle — through its center:</p>
<p><img alt="The length of line AB is equal to the diameter of the circle." src="https://miro.medium.com/v2/resize:fit:700/1*IKWfoDmaYVDhsqO0EfmsVg.png" style="height:442px; width:700px" /></p>
<p>The length of AB is equal to the diameter of the circle</p>
<p>Choose a point somewhere on the circle (but not on the line), and call it <em>C</em>.</p>
<p><img alt="We now have a circle with point A, B and C. A and B form a straight line with O, the center of the circle." src="https://miro.medium.com/v2/resize:fit:700/1*WwzkfzAAgLVlhmoCdlrlgg.png" style="height:437px; width:700px" /></p>
<p>And finally, draw lines <em>AC </em>and <em>BC</em>:</p>
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