CBSE Class 10 Maths Notes Chapter 11: These are the class 10 maths notes for the topic "Constructions." The revision of concepts for the CBSE Class 10 Board Exams is aided by these notes.
This article will go into detail on how to construct the line segment division, how to construct tringles using the scale factor, and how to construct tangents to a circle with two separate scenarios. Read the article below to find out more.CBSE Class 10 Maths Notes Chapter 11 PDF
Bisecting a Line Segment
Step 1: Draw arcs that are centred at both ends of the line segment and cross on either side, using a radius greater than half the length of the line segment. Step 2: Connect the intersecting points. The line segment connecting the places of junction divides the line segment in half.Step 1 : Draw any ray A X , making an acute angle with line segment A B .
Step 2 : Locate 5 (= m + n) points A 1 , A 2 , A 3 , A 4 a n d A 5 on AX such that A A 1 = A 1 A 2 = A 2 A 3 = A 3 A 4 = A 4 A 5
Step 3 : Join B A5. ( A ( m + n ) = A 5 )
Step 4 : Through point, A 3 ( m = 3 ) , draw a line parallel to B A 5 (by making an angle equal to ∠ A A 5 B ) at A 3 intersecting AB at point C.
Then, AC: CB = 3: 2.Constructing a Similar Triangle with a Scale Factor
Suppose we want to construct a triangle whose sides are 3/4 times the corresponding sides of a given triangle. BB 3 /BB 4 = 3/4Steps of Construction:
Step 1 : Draw any ray B X making an acute angle with side B C (on the side opposite to the vertex A).
Step 2 : Mark 4 consecutive distances(since the denominator of the required ratio is 4) on B X as shown.
Step 3 : Join B 4 C, as shown in the figure.
Step 4 : Draw a line through B 3 parallel to B 4 C to intersect BC at C’.
Step 5 : Draw a line through C’ parallel to AC to intersect AB at A’. Δ A ′ B C ′ is the required triangle.
The same procedure can be followed when the scale factor > 1. When building a triangle that resembles a given triangle using a particular scale factor, there are two scenarios. They are as follows:Case 1: The scale factor is less than 1 and the triangle that needs to be built is less than the triangle that is provided.
Case 2: The scale factor is bigger than 1 and the triangle that needs to be built is larger than the triangle that is provided.
In this case, the scale factor refers to the ratio between the sides of the given triangle and the sides that need to be produced for the triangle.CBSE Class 10 Syllabus 2024-25
Tangents: Definition
A tangent to a circle is a line which touches the circle at exactly one point .For every point on the circle, there is a unique tangent passing through it.
ii) When the point lies on the circle, there is accurately only one tangent to a circle.
iii) When the point lies outside of the circle, there are exactly two tangents to a circle.