You can use the graph to measure the side lengths, then can use them to evaluate area by using formula of area of triangle.
The area of triangle GHJ is given by:
Option B: 6 squares unit.
What is the area of triangle?
Area shows how much space the triangle is taking in terms of unit squares (squares made by unit(1) length (cm or ft or inch etc) )
The formula for area of a triangle with the height h and base b is:
[tex]A = \dfrac{1}{2}.h.b[/tex]
How to find the height and base for given triangle?
Since the side HJ is straight vertical to line GH (which is horizontal), thus its length is height of the triangle with base GH.
Base length = |GH| = 3 units (count the squares it takes in graph)
Height length = |HJ| = 4 units
Thus, area of given triangle is:
[tex]A = \dfrac{1}{2}.h.b = \dfrac{1}{2} \times 4 \times 3= \dfrac{12}{2} = 6 \rm \: sq. \: units[/tex]
Thus, Option B: 6 squares unit. is correct.
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