WebExample 3: The circumference of a wheel is 440 cm. Find its radius and diameter. Solution: Given, The Circumference of the wheel = 440 cm. Circumference of a circle formula = 2πr. Let us substitute the known values to find the radius first. 440 = 2πr. 440 = 2 × (22/7) × r. radius = 70 cm. Diameter = 2 × radius.

pi - Why would we use the radius of a circle instead of the …

WebArea is defined as the total space taken up by a flat (2-D) surface or shape of an object. The space enclosed by the boundary of a plane figure is called its area. The area of a figure is the number of unit squares that cover the … WebThe distance around the edge of a circle (or any curvy shape). It is a type of perimeter. See: Perimeter. Circle. portsmouth licensing

Arcs, ratios, and radians (article) Khan Academy

WebIf you double the radius of a circle, its area will quadruple, because you must multiply by the factors in which you increased or decreased the side length (s), or in this case, the radius. Thus you would do 2x2, which would give you four. WebFeb 2, 2024 · Use the formulas to calculate the circumference and area: c = 2πr and A = πr². The circumference should equal c = 2π × 8 cm = 50.265 cm. The area should equal A = π … WebMar 25, 2016 · Hence, the area enclosed by the triangle is A = 1 2 s a = 1 2 [ 2 r sin ( π n)] [ r cos ( π n)] = 1 2 r 2 [ 2 sin ( π n) cos ( π n)] = 1 2 r 2 sin ( 2 π n) Since the area enclosed by the regular polygon is comprised of n such triangular regions, the area enclosed by the regular polygon is A = 1 2 n r 2 sin ( 2 π n) oq e wifi 6