FINDING AREA OF TRIANGLE PRACTICALLY IN MATHEMATICS LAB


REQUIRED MATERIAL

CARDBOARD
SCISSORS
PHYSICAL BALANCE / DIGITAL SPRING BALANCE

PROCEDURE

Cut the cardboard into triangular shape. Measure the weight of this triangular cardboard with the help of spring balance. Note down the weight on a notebook. Now measure a piece 1 cm x 1 cm from somewhere within the triangular cardboard and cut it. Measure the weight of this piece with the spring balance and note it on the notebook. Then comes the calculation part.

Suppose
Weight of triangular lamina = x gm
Weight of 1 square cm of lamina = y gm

Now Using Unitary Method

y gm is the weight of 1 square cm of lamina
1 gm is the weight of 1/y square cm of lamina
x gm is the weight of x/y square cm of lamina.

Therefore
Area of Triangular Lamina = Weight of whole lamina / Weight of 1 square cm of lamina.

Verify by finding area of triangle by Heron's formula.

Use this activity method to find areas of different plane figures and verify by using universal formulae.


    

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