The on a ruler are cm and mm. A is used to draw circles and arcs. A is used to draw angles and measure angles. To name a line you need letters. To name a triangle you need 3 . To name a square you need 4 letters. If you draw a line from one corner to the opposite corner of a rectangle, this is called a . This line cuts the rectangle exactly in . It the rectangle. A diagonal also bisects a parallelogram and bisects a square. Vertically opposite angles are . Corresponding angles are . A straight angle is equal to degrees. lines cross each other at 90 degrees. lines never meet.