One angle of this triangle is 90 degrees.

He smiled triumphantly.

His strong point is mathematics.

Ryo is good at calculating angles.

He was able to solve the complex calculation quickly.

He was calculating in his head.

The mountain rises at a steep angle.

We always take into account the needs of our regular customers.

The scutes of this crocodile are very hard, playing a defensive role.

He solved complex mathematical problems using his new calculator.