As if a Right angled parallelogramme be comprehended of the base foure, and the height three, the Rationall made shall be 12.
A right angled triangle is that which hath one right angle: An obliquangled is that which hath none.
If two perpendicular lines be knit together, they shall make a right angled triangle.
This construction and manner of making of a right angled triangle, is drawne out of the definition of a right angle.
If a right angled triangle be equicrurall, each of the angles at the base is the halfe of a right angle: And contrariwise.
Right angled triangle blocks, made right and left, are used to regulate the entrance.
The imagination representing an obtuse angled triangle sees something very different from an acute or right angled triangle.
In right angled weaving the figures combine in straight lines, which run parallel or cross at uniform distances and angles.