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The answer will depend on what aspect the 21 units refer to!

Q: What unit of diameters equals 21 units?

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A circle with a radius of 21 units has a circumference of 131.95 units.

A square foot is a unit of area. A yard is a unit of length. The two units are therefore incompatible.

Perimeter of PAKE = 42 units so PA + AK + KE + EP = 42 units But, since PAKE is a parallelogram, PA = KE and EP = AK which gives KE + AK + KE + AK = 42 units or AK + KE = 42/2 = 21 units. Now, perimeter of AKE = 33 units that is AK + KE + EA = 33 units But AK + KE = 21 units so 21 + EA = 33 units so EA = 33 - 21 = 12 units.

28*21 equals 84

A measurement of area is impossible to convert into a linear measurement. The two units are therefore incompatible.

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A circle with a radius of 21 units has a circumference of 131.95 units.

49 + c units

Inch and centimeter are both linear units of measurement. They are used to measure small distance. The conversion is done by multiplying the inch measurement by 2.54. The above unit in centimeters equals 2.1 cm (Approximately).

A square foot is a unit of area. A yard is a unit of length. The two units are therefore incompatible.

Perimeter of PAKE = 42 units so PA + AK + KE + EP = 42 units But, since PAKE is a parallelogram, PA = KE and EP = AK which gives KE + AK + KE + AK = 42 units or AK + KE = 42/2 = 21 units. Now, perimeter of AKE = 33 units that is AK + KE + EA = 33 units But AK + KE = 21 units so 21 + EA = 33 units so EA = 33 - 21 = 12 units.

The area is 99.0 square units.

The atomic mass unit is equal to 931,494 061(21) eV/c2.

People that go in young offenders units are aged between 15 and 21! They go in there as a punishment. They are too young to go into a prison so they go into a young offenders unit instead. People that go in young offenders units are aged between 15 and 21! They go in there as a punishment. They are too young to go into a prison so they go into a young offenders unit instead.

The volume of a sphere with a radius of 21 units is: 12,348 units 3

21 equals dots on a dice

28*21 equals 84

A measurement of area is impossible to convert into a linear measurement. The two units are therefore incompatible.