Respuesta :
i think all three statements are true because the definition of a right angle is an angle that is 90º, and 12º means that its an obtuse angle bc its greater than 90º, and a straight angle is 180º
Answer: All bi-conditional statements are true.
Step-by-step explanation:
Since we have given that
1) A angle is a right angle if and only if the measure of the angle is 90 degrees - True.
As we know that in right angled triangle, one angle must be of 90°.
2) An angle measures 120 degrees if and only if the angle is an obtuse angle - True
As obtuse angle means angle should be greater than 90° but less than 180°.
And 90°<120°<180°
3) An angle measures 180 degrees if and only if the angle is a straight angle. - True
As we know that measure of straight angle means 180°.
Hence, all bi-conditional statements are true.
