If you mean d*r = r*d (where * means multiply_
then it is the commutative property.
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It is the commutative property of multiplication over whatever set r and d belong to.
Renee is 16 and Dana is 8. Four years ago, Renee was 12 and Dana was 4 R = 2 (D) R-4 = 3(D-4) Substitute 2D for R 2D-4 = 3D-12 8 = D
basically a times b = b times a
d * pi or 2 * r * pi Where d is diameter and r is radius and pi = 3.14159
r+d/t
4C times D is the same as 4CD in algebra which means 4*D*C