use a yard stick
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No, a ruler is used only to measure length, width or height. You must use a protractor in order to measure the degrees in an angle.
only solids have "lateral area". triangles have "area". the area of a scalene triangle is given by heron's formula. height not needed.
The easy way to find the length of a pencil is to use a ruler to measure it. A "small" ruler might not make it, but a "regular" one foot ruler will do the job nicely.
Use a tape measure!
It is often called a straight-edge.