Algebra II? need help?

Question

one angle of a quadrilateral has measure a . find the average of the measures of the other three angles. explain.

Answer 1

well in a quadrilateral, the angles add to 360, right? if I know one of them is a , that means the rest add up to 360 - a.

and since there are 3, each one has a measure of (360-a)/3  that'd be the average

Answer 2

The sum of all the angles is 360.

So the sum of all the other angles is 360 - a

The average is the sum divided by how many there are (3)...

(360 - a) / 3

Take care,

David

www.tutor-homework.com (homework help)

Answer 3

(360-a)/3

All quadrilaterals total up to 360 degrees.  Subtract one angle and divide by three to find the average of the remaining angles.