Pace work

8 form

06/04/2020

Тема: «Прямокутник»

A rectangle is a shape with four sides and four corners. The corners are all right angles. It follows that the lengths of the pairs of sides opposite each other must be equal.

Tables, boxes, books, and paper look like rectangles.

A rectangle with all four sides equal in length is called a square.

Formulas

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The formula for the perimeter of a rectangle.

If a rectangle has length 

ℓ$$\ell$$

 and width w

·         it has area 

K=ℓw$$K=\ell w$$

,

·         it has perimeter 

P=2ℓ+2w=2(ℓ+w)

,

·         each diagonal has length 

d=ℓ2+w2−−−−−−√$$d=\sqrt{{\ell }^2+w^2}$$

,

·         and when 

ℓ=w$$\ell =w$$

A rectangle is a 2D shape in geometry, having 4 sides and 4 corners. Its two sides meet at right angles. Thus, a rectangle has 4 angles, each measuring 90 ̊. The opposite sides of a rectangle have the same lengths and are parallel.  Two sides are said to be parallel, when the distance between them remains the same at all points.

Other names of the rectangle

·         Since all the angles of a rectangle are equal, we also call it an equiangular quadrilateral.

·         Since it has parallel sides, we can also call it a parallelogram. A parallelogram is a quadrilateral whose opposite sides are equal and parallel.

Area of a rectangle: 

The area of a rectangle is the product of its two adjacent sides

Area of a rectangle = Length × Width

 Perimeter:  

The perimeter of a rectangle is the sum of the length of its four sides.  Since parallel sides of a rectangle have the same length, the formula for the perimeter of a rectangle is

Perimeter of a rectangle = Length + Width + Length + Width

                                                  = 2 length + 2Width

                                                  = 2 (length + Width)

 Let`s watch these videos and answer the questions!

https://www.youtube.com/watch?v=tFNFSCiTa3U

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https://www.youtube.com/watch?v=aUYOoXsGw-0