That dome-shaped building has become a landmark of the city.

Please calculate the area of this right-angled triangle.

He was drawing a tridecagon shape.

This figure is an acute triangle.

He taught me how to calculate the area of an obtuse triangle.

He is studying late into the night to learn a new computer language.

I analyze data using a spreadsheet software.

The time complexity of this algorithm is O(n).

The space complexity of this algorithm is O(n).

This computer is using the latest technology.