Chapter 4.1, Problem 3CVC

Fill in each blank so that the resulting statement is true.

If $0^{{}^{\circ }}<\theta <{90}^{{}^{\circ }},\theta$ is a/an____________ angle.

If $\theta ={90}^{{}^{\circ }},\theta$ is a/an_______________ angle.

If ${90}^{{}^{\circ }}<\theta <{180}^{\circ },\theta$ is a/an_____________ angle.

If $\theta ={180}^{\circ },\theta$ is a/an_____________ angle.