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Sunday, November 20, 2011

Tianna's Textbook Question 2.4

Question 31 part a


The area of a triangle can be determined using Heron's formula, which requires the side lengths of the triangle. Heron's formula is A = √s(s-a)(s-b)(s-c). In the formula A is the area; a,b and c are the side lengths; and s is half the perimeter or a+b+c/2. Determine the area of each triangle with the following side lengths. Express each area to the nearest tenth of a squared centimetre.


a) 15 cm, 12 cm, 10 cm
You should start off by finding the perimeter then dividing it by 2.

P = s + s + s
= 15 + 12 + 10
= 37

s = P ÷ 2
= 37 ÷ 2
= 18.5

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