Solve this exercise using the fact that the sum of the measures of the three angles of a triangle is 180degrees°.
in a triangle, the measures of the three angles are x, x − 21, and x - 12. what is the measure of each angle?

Fill in the blank 1. a rhombus is a rectangle a) always b) sometimes c) never 2. a square is a quadrilateral a) always b) sometimes c) never 3. a trapezoid is a kite a) always b) sometimes c) never 4. a quadrilateral is a kite a) always b) sometimes c) never 5. a square is a rhombus a) always b) sometimes c) never 6. a parallelogram is a rectangle a) always b) sometimes c) never