कोरोना महामारी फैलने के दौरान अपने छोटे भाई को उससे सुरक्षित रहने के लिए 35 40 शब्दों में संदेश लिखें
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Solid angles can also be measured in square degrees (1 sr = (180π)2 square degrees), in square minutes and square seconds, or in fractions of the sphere (1 sr = 14π fractional area), also known as spat (1 sp = 4π sr).
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