Cut a strip of paper sheet. Fold it along its length. Now mark centimetres and half centimetre along its length using a ruler. Answer the following questions: 1. What is the range of your paper scale? 2. What is its least count? 3. Measure the length of a pencil using your paper scale and with a metre ruler. Which one is more accurate and why?
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Explanation:
For an equilateral triangle with side ‘a’, area
∴ Each side of the triangle = a cm
∴ a + a + a = 180 cm
⇒ 3a = 180 cm
Now, s = Semi–perimeter
∴ Area of a triangle
∴ Area of the given triangle
Thus, the area of the given triangle
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