Question

two complementary angle differ by 12 . find the angle​

Answer 1

let angles be x and x+12
x+x+12=90
2x. = 90-12
2x. = 78
× = 78/2
x. = 39
second angle = x+12
= 39+ 12
= 51
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Answer 2

If two angles are complementary, the sum of their measures is 90 degrees. 
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Call one of the angles x.
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This means that its complement is 90 - x degrees.
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But the difference in their measures is 12 degrees. Therefore, you can write the equation:
.
x - (90 - x) = 12
.
Since the parentheses are preceded by a minus sign, you can remove the parentheses if you also
change the signs of the terms inside the parentheses. Therefore, when you remove the parentheses
the equation becomes:
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x - 90 + x = 12
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Combine the two x terms on the left side to get:
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2x - 90 = 12

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Get rid of the -90 on the left side by adding 90 to both sides to get:
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2x = 102
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Solve for x by dividing both sides of the equation by 2 to get:
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x = 102/2 = 51
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So the measure of one of the two angles is 51 degrees. Its complement is the amount that
must be added to that angle such that this sum is 90 degrees. By subtracting 51 from 90 
degrees, you find that the complement of the angle is an angle of 39 degrees. Note that 
the difference in the two angles is 51 - 39 = 12 degrees, just as the problem specified.
.
The answer to this problem is that the measures of the two complementary angles are 51
degrees and 39 degrees.
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Hope this helps you.............