development of lateral surface of a cone will be
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The correct option is “C”. "When the curved surface of a cone is opened and laid on a plane, it shows the shape of a sector. ... The radius of the sector will be equal to the slant height of the cone. The length of the arc will be equal to the circumference of the base of the cone, i.e. 2πr.
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DEVELOPMENT OF SURFACES OF SOLIDS. MEANING:ASSUME OBJECT HOLLOW AND MADE-UP OF THIN SHEET. CUT OPEN IT FROM ONE SIDE AND UNFOLD THE SHEET COMPLETELY. THEN THE SHAPE OF THAT UNFOLDED SHEET IS CALLEDDEVELOPMENT OF LATERLAL SUEFACES OF THAT OBJECT OR SOLID. LATERLAL SURFACE IS THESURFACE EXCLUDING SOLID'S TOP & BASE.
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