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Q: Is the diameter equals 3 x r correct?

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No. Diameter = 2 x r

Yes it is, where r is the radius

12

diameter ------------- Diameter. The R (radius) of a circle multiplied by two equals the diameter.

radius=1/2 diameter so R=3cm

the diameter is 2times the radiusr=33ind=66in

Area of a Circle: A = (pi) * r ^ 2 (Area equals Pi Times the radius Squared) R = 3/2 (Diameter = 3, Radius = 1/2 of the Diameter) A = 3.1415 * (3/2)^2 A = 3.1415 * 2.25 A = ~7.068 Square Feet

if r=5z and 15z =3 then r=10y

The radius of a circle with diameter or 8 inches is 4 inches. The diameter equals 2 times the radius or d=2*r. --> 8 in = 2*r so, r = 4 in

I

72, double the radius because radius is half of the whole diameter.

3 equals rings in a circus

r = 5z 15z = 3y (divide by 3 to both sides) 5z = y r = y

Diameter divided by 2 equals radius r=d/2 For example, if the radius was 3.5, the diameter would be 7.

Diameter, the line that dissects the circle exactly in half.

R(10) If you know the Circumferance, divide it by Pi (about 3.14). That will tell you the diameter. Half the diameter equals the radius.

Diameter is two times the radius, in our case the radius is 10.4 inches, Can you now find the diameter. I am sure you can, good luck!

No. Because you have only a single 'r' before 'equals', but after it there are two 'r's.One 'r' is correct . . . difference .

10 = r + 3 Subtract 3 from each side: 7 = r

volume of a sphere is 4/3 pi x r^3 or, 4/3 x 3.142 x r ^3 r, or radius would be 1/2 the diameter, hence r ^3 would come to (d^3)/8 Solved :-)

pq-r, if p is 3, q is 4, and r is -6 is equal to 3 x 4 - (-6), which is equal to 12 + 6, which is equal to 18.

4/3 pi r^3 = 100r = (100*3/4/pi)^(1/3) r = 2.87989833828654 d = 2*r d = 5.75979667657308 cm The diameter is 5.75979667657308 cm

You subtract 11 from both sides and r equals negative 7. See... r+11=3 -11 -11 r=7

If the following are the definitions of the symbols referenced in the question: c = circumference r = radius d = diameter l = length w = width then NONE of the formulas listed in the question is correct. The circumference of a circle is (pi) times d. d is the diameter, (pi) = 3.14156 (rounded)

12 = r/3 + 16