The prime factors of 21 are 3 x 7, so the prime factors of 21 squared are 32 x 72. The factors of 21 squared are 1, 3, 7, 9, 21, 49, 63, 147, and 441.
3a squared b squared
21 km squared
7 The dimension you provide is not a squared dimension but a linear dimension. There are no squared dimensions in a linear dimension. There are 7 linear yards in 21 linear feet, but no squared yards.
5*root(21^2) = 5*21 = 105
21
21
21
112 - 102 = 21
6x2-5x-21 = (3x-7)(2x+3)
21.
No, 441 is though (it is 21 squared)