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.
inches
Millimeters or centimeters.
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.
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.
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
You could use either inches or centimeters to measure the width of a sheet of paper.
centimeter?
Centimetre.
Parsecs
A tape measure.
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.
a ruler
inches
Millimetres
You use a ruler or tape measure.
It is very hard to to measure the width. But for length you can use a tape measurer.