What is solid and plane angle?What is basic difference between plane angle and solid angle?

समतल कोण और ठोस कोण में मूलभूत अंतर क्या है?What is meant by plane angle?
समतल कोण क्या है ?ठोस कोण क्या है?समतल कोण और ठोस कोण का मात्रक क्या होता है?
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