Example 1: Find the area the circle with a diameter of 10 inches. Solution: Step 1:Write down the formula:A = πr2 Step 2:Change diameter to radius: Step 3:Plug in the value:A = π52= 25π Answer:The area of the circle is 25π ≈ 78.55 square inches. ...
The area of a circle is:π (Pi) times the Radius squared:A = π r2 or, when you know the Diameter:A = (π/4) × D2 or, when you know the Circumference:A = C2 / 4πExample: What is the area of a circle with radius of 3 m ? Radius = r = 3 Area= π r2 = π× ...
Arc of a Circle:An arc of a circle is referred to as a curve that is a part or portion of its circumference. Acute centralangleswill always produce minor arcs and small sectors. When the central angle formed by the two radii is 90o, the sector is called a quadrant because the total ...
The formula for the area of a circle is A = πr2, where r is the radius of the circle. The unit of area is the square unit, for example, m2, cm2, in2 etc. In this article, we will learn terms related to circles, like radius, diameter, perimeter, area of the circle, etc. ...
Area of a CircleCircles can be witnessed from micro to macro-objects around us. For example, our Earth is a flat circle; the moon is a gigantic circle; your dog might be playing with a circular ball, and much more. A circle is a two-dimensional shape whose locus is equidistant from ...
Example 3 Sketch the circle(x+ 4)2+ (y− 5)2= 36 Answer b. The General Form of the Circle An equation which can be written in the following form (with constantsD,E,F) represents acircle: x2+y2+Dx + Ey + F= 0 This is called thegeneral form of the circle. ...
Example #1 Using the area of a circle formula, calculate the area if the radius is 4 inches. Area = pi × r2= 3.14 × 42= 3.14 ×16 = 50.24 in.2 Notice that the unit (inches) is squared to show that it was multiplied by itself twice. ...
Example: find the area of a circle Task 1: Given the radius of a circle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 52= 3.14159 x 25 = 78.54 sq in. Task 2: Find the area of a circle given its diameter is 12 cm....
For example, suppose we have a circle that has a radius of 7 cm as shown in the figure below. Its area is given by – Area = πr2= $\frac{22}{7}$ x 7 x 7 = 154 cm2 Suppose, instead of the radius we are given the diameter of a circle, how do we calculate the area?
circleareaarefirstcalculatedseparately,andthenthearea ofthecircleiscalculated.Whenaskedtolistacombined formula,youcangetasimplealgorithmfor3.14*(152102). Example5,"doado"intheexercises,similartothecase5. Throughthecalculationofthisproblem,tomakestudents ...