If you mean what units, that would be meters.
Yes you have to use the pythagorean theorm to find the length of a right triangle. But you must subtract A2 from C2 then square root the answer.
If you know the length of the sides but not the diagonal, you can use the Pythagorean Theorem.
To measure the length of a hallway, you would typically use a measuring tool such as a tape measure or a measuring wheel. Start at one end of the hallway and extend the measuring tool to the other end, ensuring it is straight and taut for an accurate measurement. Record the measurement in the appropriate units, such as feet or meters, to determine the length of the hallway.
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.
A ruler or tape measure.
Meters
Square feet (length x width).
steel rulemeasuring tapelaser measuring deviceruleyardstick...
The metric unit of the meter would be the appropriate measure of the area of classroom. Calculating area involves multiplying the length (in meters) of the classroom's length and width. Area of the classroom would be in square (^2) meters.
If you mean what units, that would be meters.
meeters?
a ruler
Meter stickI'm thinking you would use a tape measure
Every school is different. The layout of every school is also different. So you will need to find the distance from your classroom to the principal's office in your own school. Ask your teacher's permission to use a tape measure or yardstick to measure the hallway length between the two points.
Feet and inches or metres and centimetres.
Feet would probably be the most efficient way.