How to find the area of this quadrilateral?

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An explanation would be very much appreciated :)

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Answer 1 · 2018-02-25T10:33:52

108 #cm^2#

To find the area of the quadrilateral, we have to find the area of the two triangles.

The question already gives you the height and the base length of the two triangles, which are 6 cm and 18 cm respectively.

All we need to do is use the formula for the area of a triangle which is, #A=1/2bh#.

Plug in #b=18# and #l=6# into the formula.

Therefore, A = #1/2 * 18 * 6# = 54

Since there are two triangles,
#54 * 2 = 108#

#therefore#The are of the quadrilateral is 108 #cm^2#