Question 1154497
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A rough sketch of the circle and line give a quick picture that makes it easy to solve the problem.<br>
You could easily find the points of intersection algebraically by substituting y=x+2 in the equation for the circle.<br>
However, a bit of simple mental arithmetic shows that the values of x and y, ignoring the signs, are 3 and 1; the rough sketch then determines that R is (-3,-1) and E is (1,3).<br>
Then, since RD is a diameter (cutting the circle into two 180-degree arcs), angle RED is 90 degrees.<br>