TRIGONOMETRIC FUNCTIONS Expressions (Page 8 of 8)

Another formula that is used for the area of a triangle is Heron's formula, A = sqrt(s(s-a)(s-b)(s-c)), where s is given by s = (1/2)(a+b+c). Suppose a = 12, b = 8 and c = 14. First, we will find the value of s, called the semi-perimeter of the triangle, and store it in a variable. Then we will compute the area using this value of s.

 CLEAR key.

 Left parenthesis key. 1 Divide key. 2 Right parenthesis key. Left parenthesis key. 12 Plus key. 8 Plus key. 14 Right parenthesis key.
 STO key. ALPHA key. ALPHA S key. ENTER key.

 Calculator screen image.
 2nd Square root key. ALPHA S key. Left parenthesis key. ALPHA S key. Minus key. 12 Right parenthesis key. Left parenthesis key. ALPHA S key. Minus key. 8
 Right parenthesis key. Left parenthesis key. ALPHA S key. Minus key. 14 Right parenthesis key. Right parenthesis key. ENTER key.		 Calculator screen image.
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