Hello Friends, in today's class we all are going to discuss about one of the most interesting and a bit complex topic of mathematics, geometry. In VIII grade gujarat board students are familiar with algebraic expressions of mathematics , but geometry is new subject for them . First of all one question arises in student’s mind what is geometry ? Basically when we study about shape like Triangle, size and figure of space than this study is called as a geometry (Learn more about natural numbers here),
like when two points meets it makes line and four lines make rectangle , square etc . For understanding the properties of geometry what grade VIII student supposed to do, they have to study about coordinate system and Transformations on a coordinate plane . coordinate system is basically a system which tell position of points or position of geometry element . We can understand coordinate system by coordinate plane . So, first of all we have to understand coordinate plane . coordinate plane is basically two intersecting lines (combination of horizontal and vertical lines) where horizontal line is known as a x coordinate and vertical line is known as a y coordinate , for example we have a line on a plane whose one point coordinate is (0,1) means x direction coordinate is 0 and y direction coordinate is 1 . But when we want to study about 3D coordinate of space, we have to include z coordinate on plane which shown outward direction form plane and in 3d , coordinate plane work as a ( x, y, z ) coordinates .Now , when we move some point with same distance in same direction on plane , then this process is called as a Transformations on a coordinate plane . We can understand Transformations on a coordinate plane with an example like when we move table from one place to another in room , then we have to move each bottom legs of table with same distance in same direction . In mathematical point of view , when we move one object P (x , y) with a units in horizontal direction ( moves right ) and b units in vertical direction ( moves upward) on coordinate plane , then after this Transformations on a coordinate plane process coordinate of object P( x +a , y +b) . Here one think is noted that in horizontal direction moves right shows positive movement and moves left shows negative movement of object and in vertical direction upward movement shows positive movement and downward movement shows negative movement of object . So, we take some example to understand Transformations on a coordinate plane –
Let one point A (2 , 3) is moves right with 2 unit and moves up with 5 unit then after transformation coordinate of A ( 2 + 2 , 3 + 5 ) or A ( 4 , 8 ) .
Similarly when A( 2, 3 ) is moves left with 1 unit and move up with 3 unit then after transformation coordinate of A ( 2 – 1 , 3 + 3) or A ( 1 , 6)
So, I hope u understand about geometry portion of Eighth Grade syllabus and Read more maths topics of different grades such as Basic constructions
in the next session here.
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