rulers

"The teacher used a rectangular whiteboard to draw a diagram. "

"He is a student of life."

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The students used their notebooks to take notes during the lecture. "

"The student used a straightedge to draw a perfectly straight line in her math notebook. "

"The measurement of the room's length was important for ordering new furniture. "

"We measured the temperature with a thermometer.   You should measure the angle with a spirit level."

"The graduations ceremony was filled with joyful tears and proud smiles. "

"The teacher graded the test, leaving red markings where answers were incorrect. "

"The straight path to the school led past the park. "

"With a simple remote, he could control the toy truck."

"The teacher told us that the next exercise is to write an essay."