How to Calculate the Area of a Sector and the Length of an Arc. Perimeter of a Semicircle Formulas & Calculator. Semicircle is exactly half the entire circle. Given any 1 known variable of a circle, calculate the other 3 unknowns. Circle formulas and … It is another name for the perimeter of a circle.. Given the radius of the semicircle as r, the task is to find out the Area and Perimeter of that semicircle. Perimeter of semicircle = 14.135 + 9 = 23.135 Examples: Input: r = 10 Output: Area = 157.00, Perimeter = 31.4 Input: r = 25 Output: Area =981.250000, Perimeter = 78.500000 BYJU’S online semicircle calculator tool performs the calculation faster, and it displays the area in a fraction of seconds. Semi-circle is exactly half of a complete circle then its circumference or perimeter should also be half of the circumference/perimeter of circle of a complete circle, it is so but a semicircle has some part of its periphery in form of straight line so circumference or more precisely in case of semi-circle, perimeter is: πR + 2R Geometry Calculators Enter your value in one of the geometry calculators below to calculate the circumference of a circle. The diameter is twice the length of the radius. A semicircle can be seen as the shape that is formed when a circle is cut in half along its diameter. Semicircle calculators give you a list of online Semicircle calculators. Welcome to How to Calculate Circumference with Mr. J! Semicircle calculators give you a list of online Semicircle calculators. The diameter of a circle is known as the straight line segment which passes through the center of the circle. Perimeter of an Equilateral Triangle Calculator. ... the perimeter is called a circumference. Circumference and Area (Intermediate) Circumference of a Circle 1 FREE . 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