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What does the diameter of a circle equal?
2R or two times the radius.
Do two radii equal one diameter?
Yes. D = 2R
If a diameter of a circle is 28 in what is the radius?
Diameter equal 2r (d=2r) So if your Diameter is 28 then: 28=2r (divide 2 on both sides) 14=r therefor the radius is 14
How do you find the radius of a semi circle with an equal perimeter to a rectangle with 1 side 3cm and the other side equal to the radius?
Suppose the radius is R cm. Then the perimeter of the rectangle is 2*(3+R) = 6 + 2R cm. The length of the arc of the semicircle is pi*R and the length of the diameter is 2*R so the perimeter of the semicircle is pi*R + 2R The two perimeters are equal so 6 + 2r = pi*R + 2R That is, 6 = pi*R and so R = 6/pi
How do you do absolute 2r plus 9 absolute equals 5?
|2r + 9| = 5 So 2r + 9 = 5 or 2r + 9 = -5 so that 2r = -4 or 2r = -14 r = -2 or r = -7
What is 12-2R?
12-2r = 10
Factor 4r minus 25?
4r - 25 does not factor. If that were 4r2 - 25, it would be the difference of two squares, which factors to (2r - 5)(2r + 5)
What is 4r2-25 factored?
4r2-25 = (2r)2-52 = (2r-5)(2r+5)
How do you solve 2r-1 equals 9?
2r-1=9 2r =10 r =5
What do you times to -2r to get -13?
11
What would 8pr over 12p in simplest form be?
2r/3
What is 2r plus 5 less than negative 1?
2r + 5 - - 1 When simplified: 2r + 6
