alleryএকটি বৃত্তাকার বলয় 21 cm এবং 14 cm ব্যাসার্ধের বৃত্ত দ্বারা আবদ্ধ। এর ক্ষেত্রফল নির্ণয় করুন (pi = 22/7)।
A1078 cm²
B770 cm²
C308 cm²
D462 cm²
Answer & Solution
Correct answer: B. 770 cm²
বলয়ের ক্ষেত্রফল হলো π(21² - 14²) = (22/7)(245) = 770 cm²।
Keep practising Geometry & Mensuration
Browse all Geometry & Mensuration questions for RRB NTPC, or explore more Quantitative Aptitude topics.
Related questions
In three dimensions, what formula gives the volume inside a sphere of radius r?Which algebraic expression calculates the total exterior area bounding a sphere of radius For a circular cylinder of base radius r and height h, which formula gives its volume?Which formula gives the curved side area of a right cylinder with radius r and height h?What geometric solid is generated by rotating a rectangle about one of its sides?What is the longest line segment that can be drawn between two points on a sphere?What metric area corresponds to one million square metres?How many square centimetres are contained in one square metre?