Right triangle ruler: a right angle, an angle of 30 and an angle of 60.
Isosceles triangle ruler: one right angle, two 45 angles, and the sum of the internal angles of the triangle is 180.
Triangle is one of the main drawing tools for learning mathematics and measuring angles. Each square consists of two special right-angled triangles. One is an isosceles right triangle, and the other is a right triangle with a special angle (hereinafter referred to as a slender triangle). Used for measurement or drawing.
Both acute angles of an isosceles right triangle are 45 degrees. The acute angles of the slender triangular plate are 30 and 60 respectively. Two identical isosceles right triangles can be made into squares or larger isosceles right triangles. The two right angles of an isosceles right triangle are equal in length.
Two identical slender triangular plates can be spliced into a regular triangle. The length of the hypotenuse of the slender triangular plate is twice as long as the length of the short right angle side.