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SmarticalParticals
All angles of a triangle add up to 180 degrees. If it's a right triangle, the right angle is 90 degrees. If another angle is 51 degrees then the last angle has to be 180 - 90 = 90 - 51 = 39 degrees.
mickiesfair
Since it's a right triangle one angle will be 90°
■■■■■■■■■■■■■■■■■■■■
90°+51°=141°
A triangle is 180°
180°-141°=39°

THE THIRD ANGLE WILL BE 39°

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