It contains two clamps which can join two support clamps at a 90 degree angle. Its body contains two clamps which can hold two support robs at a 90 degree angle.
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The letter K. It has two acute angles, top and bottom between, the l and < and the inside angle of the < is a rightangle.
clamp
The 20-gon has 20 sides and 20 vertices. Let's pick a point approximately in the center. Join each vertex to this point. Do you see twenty triangles now? The sum of the angles in a triangle is 180 degrees. So the total of all the angles in the twenty triangles is 20 x 180 but this includes all the angles around the point you selected and to which you joined the vertices. These angles (believe or not) form a circle with a total angle of 360 degrees. This you have to take away from 20 x 180 obtained before. So the sum of the internal angles of a 20-gon is 20 x 180 -360 which is 3240 degrees or 36 x 90 degrees. The general formula for the sum of the internal angles of a plane two dimensional closed n-sided polygon is(2n - 4) x rightangles, where a rightangle is 90 degrees
for what scalene triangle used for?
they are used to exercise horses