1. The document describes a lab manual activity to verify Pythagoras' theorem by constructing a right-angled triangle with sides of lengths 3 cm, 4 cm, and 5 cm and drawing squares on each side. 2. The areas of the squares are observed to be 9 cm^2 for the square on the shortest side, 16 cm^2 for the square on the middle side, and 25 cm^2 for the square on the longest side (hypotenuse). 3. This verifies the Pythagorean theorem, that the area of the square on the hypotenuse equals the sum of the areas of the squares on the other two sides.

1. LAB MANUAL ACTIVITY
CH 3 TRIANGLES
TO VERIFY PYTHAGORAS THEOREM BY PERFORMING AN
ACTIVITY.

2. Objective
To verify Pythagoras theorem by performing an activity.
The area of the square constructed on the hypotenuse of a
right-angled triangle is equal to the sum of the areas of
squares constructed on the other two sides of a right-angled
triangle.
Prerequisite Knowledge
1.In a right-angled triangle the square of hypotenuse is equal to the sum
of squares on the other two sides.
2.Concept of a right-angled triangle.
3.Area of square = (side)2

3. Materials Required
Coloured papers, pair of scissors, fevicol, geometry box, sketch pens,
light coloured square sheet.
Procedure
1. Take a coloured paper, draw and cut a right-angled triangle ACB
right-angled at C, of sides 3 cm, 4 cm and 5 cm as shown in fig. (i).

4. 3. Paste this triangle on
white sheet of paper.
4. Draw squares on
each side of the triangle
on side AB, BC and AC
and name them
accordingly as shown in
figure.
1 2 3
4 5 6
7 8 9
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
A H
C IB
E D
F
G

5. Observation
∴ Area of square ACIH = AC2 = 9cm2
Area of square BCDE = BC2 = 16cm2
Area of square ABFG = AB2 = 25 cm2
∴ AB2 = BC2 + AC2
25 = 9 + 16
Result
Pythagoras theorem is verified.

6. Learning Outcome
Students will learn practically that in a right-angled
triangle, the square of the hypotenuse is equal to the
sum of the squares of the other two sides.