Honey, measuring the width of a triangle is as easy as measuring the distance between two of its sides. Just whip out your ruler or measuring tape, line it up perpendicular to the base, and boom, you've got your width. No need for fancy math or geometry tricks here, just good old-fashioned measuring.
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If you don't have enough other information about the triangle to allow you
to calculate the width, then you have to use a ruler or a tape measure.
Measure it!
Yes, it exists. What about it?
It depends on what information you have.
To get the area of a triangle you multiply length by width and divide by two.
For a rectangle, length X width = area. Measure the length in cm. Measure the width in cm. Multiply the length X the width to get the area in cm2.