I measured yesterday's rainfall using a pluviometer.

We installed a new flowmeter in the factory.

The altimeter on my airplane broke.

Wave function is a fundamental concept in quantum mechanics.

It's difficult to calculate the area of this hexagon.

Please calculate the area of this right-angled triangle.

Let's calculate the area of this right-angled triangle.

Please calculate the area of this right triangle.

He drew an equilateral triangle shape.

Tomorrow's flight has been cancelled as planned.