alleryA circular ring is bounded by circles of radius 21 cm and 14 cm. Find its area (pi = 22/7).
A1078 cm²
B770 cm²
C308 cm²
D462 cm²
Answer & Solution
Correct answer: B. 770 cm²
Ring area is pi (21 squared minus 14 squared) = (22/7)(245) = 770 square centimetres.
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?