The diameter of the base of a cone is 10.5 c,. and its slant height is 10 cm. The curved surface ares is:

A 150 sq. cm
B 165 sq.cm
C 177 sq. cm
D 10 sq.cm

Correct Answer: 165 sq.cm

আমরা জানি, কোণকের বক্রতলের ক্ষেত্রফল = πrl দেওয়া আছে, ব্যাস = 10.5 .: ব্যাসার্ধ, r = 10.52 = 5.25 cm হেলানো উচ্চতা 1 = 10cm .: কোণকের বক্রতলের ক্ষেত্রফল = 3.1416 x 5.25 × 10 = 165 cm
Bissoy MCQ
#গণিত #Probashi Kallyan Bank #প্রবাসী কল্যাণ ব্যাংক-সিনিয়র অফিসার-09-10-2021

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