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3-21.

For each diagram below, solve for x. Explain what angle properties or relationship(s) you used for each problem.

  1. Two adjacent angles together form a 90 degree angle. One angle is 6, x degrees. The other angle is, 4 x + 10, degrees.

  • The sum of the two angles is how many degrees?

  1. Two adjacent angles together form a straight line. The obtuse angle on the left is, 5 x + 13, degrees. The acute angle on the right is, 3 x + 7, degrees.

  • The sum of the two angles is how many degrees?