In the triangle shown below, what is the average of angles a,b,c,d, and e? A.) 30° B.) 45° C.) 54° D.) 60° E.) 72° The angles of a triangle add up to 180°.
Therefore, the angles of two triangles add up to 360°. The only known angle is 90°. The unknown angles add up to 270°. {subtracted the known angle, 90°, from the sum of all the angles, 360°} a + b + c + d + e = 270 a + b + c + d + e  = average of the five angles {added numbers and divided by the number of numbers} 5 270  = average of the five angles {substituted 270 for the sum of the unknown angles} 5 54 = average {divided} C.) 54° Ask Algebra House Comments are closed.

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