(A) The side length of the equilateral triangle is $a = 10\,cm$.The perimeter of the triangle is $P = a + a + a = 3a$.$P = 3 \times 10 = 30\,cm$.The s

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(A) The side length of the equilateral triangle is $a = 10\,cm$.The perimeter of the triangle is $P = a + a + a = 3a$.$P = 3 \times 10 = 30\,cm$.The semi-perimeter $s$ is defined as half of the perimeter:$s = \frac{P}{2} = \frac{30}{2} = 15\,cm$.

Class 9 Mathematics Heron’s Formula Mix Examples - Heron’s Formula

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Each side of an equilateral triangle measures $10\,cm$. Find the semi-perimeter of the triangle. (in $,cm$)

A
$15$
B
$17$
C
$30$
D
$20$

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Each side of an equilateral triangle measures $10\,cm$. Find the semi-perimeter of the triangle. (in $,cm$)

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