CBSE Book Class 7 Maths Activity 10B

To draw a cuboid of given dimensions (say 7 units, 4 units and 2 units) on an isometric dot paper and to draw its oblique sketch on the squared paper.

Learning Objective : To develop skill to draw 3-D shapes on a two dimensional sheet.

Pre-requisite : Familiarity with isometric dot paper. Knowledge of horizontal, vertical and slanting lines.

Materials Required : isometric dot paper, a ruler, sketch pen, pencil, and a squared dot paper.

Procedure : 
Step 1. Take an isometric dot paper and mark a point A on it [Fig. 10B(a)].

Step 2. Starting from the point A, move 7 dots upwards towards right and mark the seventh dot as B. Starting from A, move 4 dots upwards towards left and mark the 4th dot as E.

Again starting point A, move 2 dots vertically upward and mark the second dot as D [Fig. 10B(a)]

Step 3. Mark the points C, F and G following similar steps.

Step 4.Join AB, BC, CD, CG, FG, FD, EF, AD and EA to get required isometric sketch of the cuboid ABCDEFG of given dimensions.

For oblique Sketch of Cuboid 

Follow the same procedure given in Activity 10(A) and draw the oblique sketch of the cuboid on the squared dot paper

Observations : Activity 10 (A) and 10 (B)

(i) Side AB of cube ABCDEFG in Fig. 10 A(c) = ................... units

(ii) Side BC of the cube = ................... units

(iii) Side DF of the cube = ..................... units

(iv) Side AB of the cuboid ABCDEFG in Fig. 10B(a) = .................... units

(v) Side AD of the cuboid = ................ unit

(vi) Side CG of the cuboid = .................. units.

Please refer to the link below - CBSE Class 7 Maths Activity 10B