round to the nearest square unit using herons formula
a=13 yards b= 9 yards c=5 yards
Hello, Shorty!
Exactly where is your difficulty?
You do have the formula and you do have a calculator . . . right?
Heron's Formula: .$\displaystyle A\;=\;\sqrt{s(s-a)(s-b)(s-a)}$
. . where $\displaystyle s$ is the semiperimeter: $\displaystyle (a + b + c)/2 $
Round to the nearest square unit using Heron's Formula:
. . a = 13 yards, b = 9 yards, c = 5 yards
$\displaystyle s\;=\;(13 + 9 + 5)/2 \;= \;13.5$
$\displaystyle A \;= \;\sqrt{((13.5)(13.5-13)(13.5-9)(13.5-5)} \;= \;\sqrt{(13.5)(0.5)(4.5)(8.5)}$
. . $\displaystyle = \;\sqrt{258.1875} \;= \;16.0821396\;\approx\;16\text{ yd}^2$