dcba = 9 x abcd
dcba/9 = abcd
Since the quotient is also a 4 digit number, then d in order to be divided by 9, must be the biggest digit which is 9. So that d = 9 and a = 1. The same way for other digits...
So that we have:
dcba = 9 x abcd
9999 = 9 x 1111
1
160 degrees.
5 units
none of these are correct
280
bc equals st multiplied by the scale factor.
There are only two single-digit numbers where one is 1/5 of the other. Those are 1 and 5 and they become the outside numbers. From there, it's relatively easy to multiply 5 by 3 to get 15 for the inside numbers.
1
ABCD X 9 = DBCA, If A>1 then there will be the result of 5 digit number. So, A=1 and D=9. B=0, so that the extra from previous digits calculation no carry forward remains. C=8 ABCD = 1089 1089 X 9 = 9801
2178
never
never
No! It equals 4abcd!
27
25 units
38.5
If abcd is a parallelogram, then the lengths ab and ad are sufficient. The perimeter is 36 units.