alleryThe circumference of a circle is directly proportional to its diameter. The constant of proportionality is
A1/2
Bpi
C2 pi
D9.8
Answer & Solution
Correct answer: B. pi
1. Circumference divided by diameter is the same for every circle.
2. That fixed ratio is pi, about 3.14.
3. 2 pi is the ratio of circumference to radius, not diameter.
_Source: Wikipedia, Proportionality (mathematics), Examples_
Keep practising Ratio
Browse all Ratio questions for CTET, or explore more Mathematics topics.
Related questions
Which pair of ratios forms a proportion?For what value of x are 4, 6 and x in proportion, meaning 4:6 = 6:x?If 3:5 = x:20, what is x?A speed of 60 km/h is held steady. How far does the car go in 2.5 hours?A mix uses cement : sand = 1:2. If 6 bags of cement are used, how many bags of sand are neMilk and water are mixed 3:2 to make 20 litres. How many litres of water are in it?Rs 900 is shared in the ratio 4:5. What is the bigger share?The ratio of boys to girls in a club is 2:5. There are 14 boys. How many girls are there?