Guide
1
Square - the equilateral rectangle in which each angle is 90 °.To find the area (S) is necessary to multiply the length (l) to width (b).Since in this figure, the length and width are equal, it is sufficient to know one of the variables.The unit of area: see ?, m ?, km?etc. For example: the length of one side of the square = 5 cm. It is necessary to calculate the area.Find it by the formula: S = l * b.
S = 5cm * 5cm.
S = 25cm ?.
Answer: Square square with sides of 5 cm is 25 cm ?.
2
Cube - a polyhedron in which every face - the square.The cube has twelve edges which are equal to each other (
ie, length, width and height of one side - the length (height) of the rib) and six equal sides.To find the volume of a cube, you need to multiply his three edges (a).Units of volume: dm ?, See ?, m?and t.p.Naprimer: edge length of 5 cm. We need to find the volume of a cube.Calculate using the formula:
V = A * A * A or V = a ?.
V = 5 cm * 5 cm * 5 cm.
V = 125 cm?
answer: the volume of a cube with an edge length of 5 cm is 125 cm ?.
3
If you want to calculate the area of ​​all sides of the cube, you must first find the area of ​​one side, and then summarize the area of ​​all six sides.For example, it is known that the length of one side of the cube 5 cm. We need to find its surface area.The solution has the form:
1. S = 5 cm * 5 cm = 25 cm?
2.?= S + S + S + S + S + S or S?= 6 * S
S? = 6 * 25cm?= 150cm?
A: surface area of ​​a cube with an edge length of 5 cm - 150cm? If you want to find one of the geometric characteristics, knowing the volume of a cube or square area , the value of the cube root of the volume extracted, and from the value of the square - square.
4
Perimeter square is the sum of the lengths of all sides.Ieyou need to add up the values ​​of its four dlin.Naprimer length square 5 cm. Calculate the perimeter.To calculate the perimeter of any rectangle can use the formula: P = 2 * (l + b).For
square formula is simplified: P = 4 * l
P = 4 * 5 cm = 20cm
answer perimeter square 5cm length - 20cm.