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- Find the circumference of a circle whose radius is 49 cm.
Question 1:
Find the circumference of a circle whose radius is 49 cm. A. 208 cm
B. 288 cm
C. 308 cm
Feedback The option should be divisible by ‘11’ because ‘p’ has been used in finding its circumference.
One of the parameters is a higher power of 7. Thus, we need to find the only option that is a multiple of 7. If, however, we find more than one option that is a multiple of 7, we need to go through fundamentals.
Among the options, 308 and 407 are both multiples of 11. However, only 308 is a multiple of 7. So circumference of the circle = 308 cm.
We can test this as follows:
Circumference of circle = 2pr cm
= 2 × (22/7) × 7 × 49 cm
= 2 × 22 × 7 cm
One of the parameters is a higher power of 7. Thus, we need to find the only option that is a multiple of 7. If, however, we find more than one option that is a multiple of 7, we need to go through fundamentals.
Among the options, 308 and 407 are both multiples of 11. However, only 308 is a multiple of 7. So circumference of the circle = 308 cm.
We can test this as follows:
Circumference of circle = 2pr cm
= 2 × (22/7) × 7 × 49 cm
= 2 × 22 × 7 cm
D. 407 cm
These questions are from this test. Would you like to take a practice test?
Practice Mensuration Online Test 3 | Englishfreetest.com
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