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Perimeters, triangles and angles

If an angle is sixteen degrees less than its supplement, what is the size of each?

The sum of two adjacent angles is fourty-two degrees. One angle is three degrees less than twice the other. Determine the value of each.

The angles of a triangle are such that one is twice as large as another while the third is twelve degrees less than the smaller. Determine all three angles.

The perimeter of a scalene triangle is 33 feet. One side is one half the length the largest side. The other side is 5 feet more than the smallest side. Determine all sides.

The perimeter of an isosceles triangle is 26 feet. The sides are seven feet longer than half of the base. Determine the length of all three sides.