Class 9 – Lab Manual Activities Homework

Class 9 – Lab Manual Activities Homework

Explore • Experiment • Understand

1️⃣ 📐 To verify the identity:

(a + b)² = a² + 2ab + b²

Use paper cut-outs to demonstrate area-based proof.

2️⃣ ✂️ To verify the identity:

a² – b² = (a + b)(a – b)

Show using overlapping squares and subtraction.

3️⃣ 🧊 To verify the identity:

(a + b)³ = a³ + b³ + 3a²b + 3ab²

Build using cubes and cuboids from acrylic sheets.

4️⃣ 📊 To find coordinates of points

Identify the abscissa (x) and ordinate (y) from graph paper.

5️⃣ 🔄 To verify angle properties:

Vertically opposite angles are equal

Linear pair of angles = 180°

Sum of angles at a point = 360°

Use transparent strips and a protractor.

6️⃣ 🔺 To verify:

Sum of angles in a triangle = 180°

Use cut-out angles and align them on a straight line.