Question

Угол а острый, если: А)0 < а < 90° Б)а=90° В)90° < а < 180° Г)а=180°

Answer 1

Ответ: б

Угол а острый, если
0 < а < 90°

Answer 2

To determine if angle "a" is acute (ostrý in Czech), we need to identify the range of values for an acute angle.

An acute angle is an angle that measures less than 90 degrees (i.e., between 0 and 90 degrees).

So, among the given options:

А) 0 < а < 90° - This is the correct option for an acute angle.

Б) а = 90° - This is not an acute angle. It is a right angle.

В) 90° < а < 180° - This is not an acute angle. It is an obtuse angle.

Г) а = 180° - This is not an acute angle. It is a straight angle.

Therefore, the correct answer is option A) 0 < а < 90°.