#Rectangle

Key R. Three ways to define it, the switch is in the top bar.

• 2 corners — click the opposite corners. Width and height fields open at the rectangle right away: type numbers or formulas, Enter accepts and lays them as dimensions, Esc keeps it as drawn.
• Centre + corner — the first click sets the centre, the second a corner. It grows about its centre.
• By 3 points — two points set a side and its tilt, the third sets the height.

#What you get

One rectangle: four sides that stay square, and a point at its centre (a rectangle drawn from its centre also shows its two construction diagonals). It needs only two dimensions — width and height — plus a tie of a corner or of its centre to make it fully defined.

• Drag a corner — the corner across stays, the width and the height change; the rectangle does not turn.
• Drag the centre — the whole rectangle goes with it.
• Double click a side — the width and height fields open again and are laid as dimensions.
• Rotate — pick the rectangle with the Rotate tool by any side; it turns as a whole. An angle dimension on a side turns it too.
• Tie the centre — click the centre point and, with Shift, the origin, an axis or another point, then pick a constraint (Coincident, Horizontal, Vertical).
• A width or a height changed grows the rectangle from the corner it was drawn from, or about its centre.

#If it did not work

• The rectangle does not turn under Rotate — it is held by other constraints or dimensions: remove or change them.
• The rectangle fell apart into four lines — a side or one of its own constraints was deleted. Ctrl+Z brings it back.

#A hint

The centre rectangle is handy when the part is symmetric about the origin: click the centre onto the origin, and the part stands symmetric.