The sum<span> of the measures of the interior angles of any </span>quadrilateral<span> can be found by breaking the </span>quadrilateral<span> into two triangles. Since the measure of the interior angles of any triangle equals 180 degrees, each of the two triangles will contribute 180 degrees to the total for the </span>quadrilateral<span>.</span>
Step 1: Divide both sides by two.
(As shown where 12x - 6 = 10 becomes halved to become 6x – 3 = 5)
Step 2: Add 3 to both sides.
(The 3 is brought to the other side to add to 5, becoming 8)
Step 3: Multiply both sides by 1/6.
(aka dividing both sides by 6, to get the fraction 8/6 which can be simplified to 4/3.)
Answer:
4 1/4, 4 2/4, 4 3/4, 5, 5 1/4, 5 2/4, 5 3/4, 6