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Two angles of a triangle each measure 70°. What is the measure of the third angle in...

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medausza | Student, College Freshman | eNotes Newbie

Posted July 19, 2011 at 8:55 PM via web

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Two angles of a triangle each measure 70°. What is the measure of the third angle in degrees?

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giorgiana1976 | College Teacher | Valedictorian

Posted July 19, 2011 at 9:12 PM (Answer #2)

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We'll begin by recalling the fact that the sum of the angles of triangle is of 180 degrees.

Since the two angles of triangle measure each 70 degrees, then we'll get:

70 + 70 + x = 180

140 + x = 180

x = 180 - 140

x = 40 degrees

The third angle of the isosceles triangle is x = 40 degrees.

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