«MODERN SCIENTIFIC CHALLENGES AND TRENDS»
SCIENCECENTRUM.PL
ISSUE 5(39) PART 1
ISBN 978-83-949403-3-1
136
For example, a student cannot show the other two heights of the triangle in Figure 1.
The varied description of drawing develops students’ spatial imagination.
Practice shows that when creating an idea of geometric concept, it is necessary to
describe the figure in several situations and mention the relevant elements. The variational
depiction of the same geometric figure enriches students’ spatial imagination. Analyzers such
as sight, hearing, and sensation play an important role in mastering geometric concepts.
Perception and imagination are the initial stages in the formation of a concept, and their rich
content ensures the rapid formation of a concept. Distinguishing between identical and non-
identical figures given in different situations and sizes develops students’ geometric
imagination.
Proper coordination of drawing with words, which is an important psychological
moment in the formation or introduction of a geometric concept, accelerates mastering
process.
In the process of interpreting geometric material, when a student is required to depict
a straight line, triangle and rectangle in an “unusual” situation is often almost unexpected. After
a brief teacher explanation, the apparent abnormality disappears. Students’ ability to
generalize develops in the lessons explained in varied description of these drawings. Similar
examples can be given for arithmetic and algebra. For example, a student often writes a specific
number for a proposal of “When the square of an odd integer is divided by 8, remainder 1 is
left”, and checks it:
32=9, 9:8 =1 (remainder 1)
52=25, 25:8 =3 (remainder 1) and so on.
In fact, the general form of writing is more convenient and includes specific proposals
of this type: (2n+1)2=4n2+4n+1=4n(n+1)+1. The result shows that the expression 4n (n + 1) is
divisible by 8, and the second addend is 1, which is the required remainder. Here, n takes natural
values.
To strengthen the geometric imagination, it is necessary to give dynamism to the
position of geometric figure under consideration. For example, construction of a figure that is
symmetrical to a given figure. When the description of a figure is given in a regular and
symmetrical way in different situations, but when their construction and conditions are
standard, students have more general idea of the figure and its elements. Discovery of the
figure and its elements, that is the knowledge of the situation in space: right, left; above, below;
horizontal, vertical, etc. find their applications in the figure. A geometric element, perceived
based on established relationships, enlivens other elements that are symmetrical in students’
B
A
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Figure 1.
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