First we have to find the radius because the circumference = 2*pi*r or pi*d and the surface area = 4*pi*r2
4/3*pi*r3 = 250 cubic cm
Multiply both sides by 3:
4*pi*r3 = 750
Divide both sides by 4*pi and then cube root both sides:
radius = 3.907963209 cm
Circumference = 2*pi*r = 24.55445702 or 24.554 cm
Surface area = 4*pi*r2 = 191.9158293 or 191.916 square cm
Check: 4/3*pi*3.9079632093 = 250 cubic cm
The circumference is defined by 2* PI * radius Your calculation is therefore correct, but is depends upon what number of decimal places you need to quote your answer. The proper answer to two decimal places is 81.68.
The circumference of a circle divided by its own diameter will leave you with pi which is about 3.142 correct to three decimal places.
Circumference: 23.5*pi = 73.827 units to 3 decimal places
circumference = 2pi50 = 314.159 cm to 3 decimal places
Fot 2 decimal places you can easily use the approximation for pi=22/7. So circumference = pi x diameter = 14 x 22/7 = 44
127.324 square units correct to 3 decimal places
The circumference is defined by 2* PI * radius Your calculation is therefore correct, but is depends upon what number of decimal places you need to quote your answer. The proper answer to two decimal places is 81.68.
The diameter of the circle is circumference/pi = 23.5682/pi = 7.501991 approximately. The answer will always be approximate and not "correct" because pi is a transcendental number and does not have a terminating or recurring decimal representation.
Circumference = 2 x Pi x r = 2 x Pi x 2.25cm = 14.14cm (approx. correct to 2 decimal places)
The circumference of a circle divided by its own diameter will leave you with pi which is about 3.142 correct to three decimal places.
Circumference is diameter*π, so the answer is 12.56636 in Area is π*r², so 16π = 50.42544 in² * * * * * Correct formulae, but incorrect answers. Radius = 4 inches implies diameter = 8 inches. So circumference = 8*pi = 25.13 inches. Also, area = pi*r2 = 16*pi = 50.265 sq inches. There is no point in giving the answer to 5 decimal places if you then use 3.15159 for pi instead of 3.14159!
Circumference: 23.5*pi = 73.827 units to 3 decimal places
circumference = 2pi50 = 314.159 cm to 3 decimal places
Fot 2 decimal places you can easily use the approximation for pi=22/7. So circumference = pi x diameter = 14 x 22/7 = 44
If you have 9 questions wrong out of 85, you have 10.59 percent incorrect answers, rounded to two decimal places, and 89.41 percent correct answers.
If its diameter is 26 inches then its circumference = 26*pi = 81.681 inches to 3 decimal places
Circumference of 20 / pi = the diameter = 6.3662 (to nearest 4th decimal)