The protection appliance has a wedge-shaped fixture block with a side surface similar to a right-angled triangle;
The results show that the isosceles right-angled triangle ribs have the highest anti-erosion ability among the three different kinds of ribs.
The three antennas which receive VHF impulses emitted by a lightning discharge are placed on the vertices of a right-angled isosceles triangle with perpendicular sides 120 meters in length.
After the plane right-angled mirror reflects the on-the- screen pictures and small fluorescent balls time and again, viewers may observe a huge ball-shaped TV screen and a large number of jumping balls, thus displaying the harmony of the movement of the micro world of nature.
