Прочитайте текст There are different shapes. They are triangles squares rectangles and circles. Tria...: ответ на тест 800546 - Английский язык

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Look at the picture. These are different shapes. They are triangles, squares, rectangles and circles.
Triangles have three sides and three angles. Squares and rectangles have four sides. Squares have four equal sides, but rectangles have two equal sides. Circles do not have angles or sides.

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There are different shapes. They are triangles, squares, rectangles and circles.
Triangles have three sides and three angles. Squares and rectangles have four sides. Squares have four equal sides, but rectangles have two equal sides. Circles do not have angles and sides.
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How many equal sides do squares have?

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Concrete is produced by combining coarse and fine aggregates, Portland cement, and water. Coarse aggregate is generally gravel or crushed stone, and fine aggregate is sand. Cement, sand, gravel and water are taken in proportional amounts and mixed. The quality of concrete depends mostly on the quality of the cement used. The process of production consists in pouring the mixed components into forms and holding them there until they harden. The process of hardening generally lasts for about 28 days.
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What does the quality of concrete depend on?

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What is a crystal? A crystal is a geometrical solid made by a natural process. Many substances absorb water from solutions when they crystallize; that is, they unite chemically with a definite proportion of water. The water with which any substance unites during the process of crystallization is called the water of crystallization.
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What is a crystal?

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Aluminium, water, oxygen, and carbon dioxide are substances. Some substances are elements and some substances are compounds. Elements have only one type of atom whereas compounds have more than one type.
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How many types of atom do elements have?

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Engineering is putting knowledge of Nature to practical use. The end result of engineering is some physical thing: a machine, a tool, a gadget. Engineering is solving problems. It’s convenient to discuss engineering projects within the framework of five steps for solving problems: define the problem, identify possible solutions, select a solution, implement the solution, verify the solution.
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What is the end result of engineering?