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How to calculate 90 degree and 40 degree elbow center >For 90 degree elbow(Dia*38.1) this formula used for only 90 degree elbow. >For 45 degree elbow(45/2of tan*Dia*1.5*25.4) this answer obtained in (mm).
The formula to calculate the surface area of a 90-degree elbow is A = πDL, where A is the surface area, D is the diameter of the elbow, and L is the centerline radius. The surface area of the elbow is essentially the curved surface area of the elbow pipe fitting. This formula is derived from the mathematical principles of geometry and calculus, specifically the surface area of a cylinder.
45 degree - if the question concerns an angle. If it is temperature, the answer depends on the scale.
A 90 degree angle can be bisected into two 45 degree angles with a compass and straight edge The diagonals of a square bisect their opposite corners into 45 degree angles
8 of them.