Practical Geometry - Maths Class 8th - Ex 4.1 - Q1 part 4 - Chapter 4 - NCERT - CBSE

Описание: Practical Geometry - Maths Class 8th - Ex 4.1 - Question 1 part 4 - Chapter 4 - NCERT - CBSE

Full exercise on Practical Geometry, fully solved. This is a video tutorial for 8th class NCERT CBSE students. For other educational stuff, subscribe and press bell icon.

You have learnt how to draw triangles in Class VII. We require three measurements (of sides and angles) to draw a unique triangle. Since three measurements were enough to draw a triangle, a natural question arises whether four measurements would be sufficient to draw a unique four sided closed figure, namely, a quadrilateral.

Constructing a Quadrilateral
We shall learn how to construct a unique quadrilateral given the following measurements: When four sides and one diagonal are given. When two diagonals and three sides are given. When two adjacent sides and three angles are given. When three sides and two included angles are given. When other special properties are known. When the lengths of four sides and a diagonal are given

Example 1: Construct a quadrilateral PQRS where PQ = 4 cm,QR = 6 cm, RS = 5 cm, PS = 5.5 cm and PR = 7 cm.

Solution: A rough sketch will help us in visualising the quadrilateral. We draw this first and mark the measurements.

EXERCISE 4.1
1. Construct the following quadrilaterals.
(i) Quadrilateral ABCD.
(ii) Quadrilateral JUMP
AB = 4.5 cm JU = 3.5 cm
BC = 5.5 cm UM = 4 cm
CD = 4 cm MP = 5 cm
AD = 6 cm PJ = 4.5 cm
AC = 7 cm PU = 6.5 cm

(iii) Parallelogram MORE
(iv) Rhombus BEST
OR = 6 cm BE = 4.5 cm
RE = 4.5 cm ET = 6 cm
EO = 7.5 cm

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