With great difficulty because angles are degrees of measurement and not area.
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The 45 degrees is an angle. To calculate an area the length and width are needed.
y345y3
A = 1/2(base)(height)
90
The answer depends on what information about the circle is given: area, radius, length and angle of arc, area and angle of sector, etc. In each case, there is a different way to calculate the diameter but, since there is no information on what is known, it is not possible to answer the question.