You change a number in any base to any other base by iteratively dividing by the second base, using the rules of arithmetic for the first base, recording the remainders in reverse order, until the quotient is zero. For instance, to change 2510 to 110012, follow the steps...
25 / 2 = 12 remainder 1
12 / 2 = 6 remainder 0
6 / 2 = 3 remainder 0
3 / 2 = 1 remainder 1
1 / 2 = 0 remainder 1
Read the remainders from bottom to top to get the result 110012.
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10 base 2 = 2 base 10
That depends what base the ' 3 ' is in now.
11011 base 2 is equal to 27 in base 10 321 base 4 is equal to 57 in base 10 27+57=84
Adding in base 2 is binary for computers. 10 = 2 because 10 means 1 of your base. The rules are no different.
There is no change in the area. Doubling the base and halving the height gives the same area. The formula for area of a triangle is A = bh/2 1/2 (base x height) Example: base 5, height 8 A = (5 * 8)/ 2 = 20 base 10, height 4 A = (10 * 4)/2 = 20