straightedge

1 The shell of Ensis directus really does look like an old-fashioned straightedge razor, narrow and thin, or a jackknife, per its other common name, Atlantic jackknife clam.

2 Now if e is given, it is not possible with the straightedge and compasses to construct a line equal to e∛2, although it is easy to construct one equal to e√2.

3 These crosspieces have vertical lines drawn upon them, and there are plumblines hanging from the straightedge over each of the lines.

4 Take the sheets of MDF, clamp a straightedge in place, and use a circular saw to cut the pieces per the cut list.

5 In those days, proving a mathematical theorem was often as simple as drawing an elegant picture; the tools of ancient Greek mathematics weren’t pencil and paper—they were a straightedge and compasses.

6 “In a puzzle, I always begin with a straightedge piece. If you wanted to cure polio or anything, where would you even start?”

7 This, like Postulate 1, requires the use of a straightedge for drawing the physical figure.

8 Lay a straightedge from mark to mark, and draw lines across the legs.

9 He moved a metal straightedge into position, making a gentle scraping sound, and drew a small line on the marble with a pencil.

10 It’s very hard to cut a straight line using a hand-held circular saw without fancy clamps and straightedges to guide the saw.

11 When the straightedge is in position, and the plumblines strike both the lines alike and at the same time, they show that the instrument stands level.

12 This is as impossible as trisecting an angle with a straightedge and compasses—unless gods and mortals are allowed to have an infinite amount of sex.

13 We have been able to make all of our constructions up to this point by means of the straightedge, or ungraduated ruler.

14 A sharp knife, a smooth board and a straightedge are all the tools needed, says Camera Craft.

15 When the workman has rolled up ten or fifteen yards, he cuts it across with a knife and straightedge, so that the paper is cut at right angles with its sides.

16 Boundaries and relationships were hierarchical, drawn with a straightedge: men dominated women, parents dominated the home, and whites dominated blacks.

17 He refused at first to come outside, then emerged carrying a straightedge razor and was fatally shot during a standoff, Detective Prieto said.

18 A number of ancient problems concerning Compass and straightedge constructions were finally solved using Galois theory.

从目前的罗盘和直尺古代建筑的一些问题终于解决了使用伽罗瓦理论。

19 A singer in the 1950s straightedge pop group The Four Preps, Larson went on to produce a series of sci-fi influenced dramas following the early success of his The Six Million Dollar Man.

20 Hunter is as straightedge as they come, but he’s, er, a difficult child.

1 直尺

rule

2 标尺

staff scale rod gunsight