A cylindrical shaped packaging for a brand of biscuits has red colour paint in the centre leaving a margin of 7 cm from top and bottom. Find the area painted red if the diameter of packaging is 10.5 cm and it is 25 cm high,
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answer :-
given :-
diameter of the cylindrical package = 10.5cm
→ it's radius = 10.5/2 = 5.25cm
height of the cylindrical package = 25cm
according to the question, the red color paint is at the center of he package leaving a margin of 7cm from top and bottom.
therefore the height of the red color area = 25 - (7 + 7)
= 25 - 14
= 11cm
hence, it's area = 2πrh
= 2 × 22/7 × 5.25 × 11
= 2541/7
= 363cm²
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