In 1797 the Italian geometrician Lorenzo Mascheroni has shown that any problem that can be constructed using a straightedge
and a compass can be constructed using a compass only.
The aim of this article is to point out the value of developing pre-service teachers', in-service teachers', and students' understanding of geometric constructions in general along with their ability to construct geometric figures using only a straightedge
, along with giving them the historical perspective of the development of geometric constructions to increase their interest and fascination with mathematics.
I lay a straightedge
on top of the gas block and lay another straightedge
on top of the receiver then just sight over the top and rotate the gas block to align the two straightedges
If you have trouble using the modified highway straightedge
after screeding because it digs into the surface, then use an 8- to 10-foot-wide channel float or check rod.
Use the straightedge
and hobby knife to cut the MonoKote and trim off any clear edges--there's usually an 1/8 inch or so clear edge at the top and bottom of the roll.
Hands-On Geometry: Constructions with a Straightedge
Loose-lay insulation comes in bags and can be tipped between the joists and levelled using a straightedge
Use a straightedge
and spirit level to ensure that the whole area is level.
For a clean, professional cut, use a thin, sharp straightedge
slicing knife, not a serrated cake knife.
THERE are two things I fear more than anything, dear readers: having my throat cut with a straightedge
razor, and having to sit through a musical.
Next, using a straightedge
and a spirit level, draw a line at this height on each wall.
Using a straightedge
, scribe a line connecting these two marks leaving a 45-degree reference line.
The top edge of the C-Level is aligned with any straightedge
object that is at least 15 yards away.
youth; complexity and contradictions of a subculture.
To check if you have enough, hold your loaded round against a straightedge
, or hold a pair of rounds side by side up to the light.