Instruction

1

If you need to find

**the area**of a circle (S) for the length of its**diameter**(D), multiply the number PI (π) on the squared length**of the diameter**, and the result divide by four: S=2 π*D2/4. For example, if the diameter of the circle is twenty inches, then its**area**can be calculated as: 3,142 * 202 / 4 = 9,86 * 400 / 4 = 986 square centimeters.2

If you need to find

**the area**of a square (S) on the diameter described around the circumference (D), construct the length**of diameter**square, and the result is split in half: S=D2/2. For example, if the diameter of the circumscribed circle is twenty inches, then**the area**of square can be calculated as: 202 / 2 = 400 / 2 = 200 square centimeters.3

If

**the area**of a square (S) you need to find the diameter of the inscribed circle (D), it is enough to build the length**of the diameter**in square: S=D2. For example, if the diameter of the inscribed circle is twenty inches, then**the area**of square can be calculated as: 202 = 400 square centimeters.4

If you need to find

**the area**of a right triangle (S) according to the known**diameter**of the inscribed m (d) and described (D) circles around it, then build the length**of the diameter of**the inscribed circle in the square and divide by four, and to the result add half the product of the lengths of the diameters of the inscribed and circumscribed circles: S=d2/4 + D*D/2. For example, if the diameter of the circumscribed circle is twenty inches, and inscribed to ten centimeters, then**the area**of the triangle can be calculated as: 102 / 4 + 20*10/2 = 25 + 100 = 125 square centimeters.5

Use the built in Google calculator to perform the necessary calculations. For example, to calculate a search

**area**of a right triangle according to the example of the fourth step, it is necessary to enter a search query: "10^2 / 4 + 20*10/2", and then press the Enter key.