Find the length of x for an arrow head
By Daniel Rodriguez •
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I am struggling to get some traction on this and need someone to show me how to calculate this. I have a GCSE question that asks:
In the attached image I'm being asked the following:
The arrowhead has an area of $3.6cm^2$. Find the length $x$.
$\endgroup$ 12 Answers
$\begingroup$The area $3.6cm^2$ is the area of the larger triangle minus the area of the smaller triangle.
$1.5\cdot h - 1.5\cdot (h - x) = 3.6$
$1.5h - 1.5h + 1.5x = 3.6$
$1.5x = 3.6$
$x = 2.4$cm
$\endgroup$ 1 $\begingroup$Hint
You can divide the area in two triangles. You can consider $x$ as the basis and thus the height is $1.5$ cm.
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