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2015-02-25T14:03:25+08:00

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First angle=x
the 2nd angle=90
the 3rd angle=y

The sum of the angles of a triangle is 180.
y=2x-15

x+90+y=180
x+2x-15=90
3x=105
Divide both sides by 3
x=35

The 2nd acute angle is:
y=2(35)-15
y=55

Hope this helps =)
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