Which of the following is not an acceptable way to name the angle shown?

<R

Step-by-step explanation:

We can name the angle by the 3 letters on the rays with the letter on the vertex in the middle

<RST or <TSR

We can name the angle by the letter in the middle if there are no other angles using the vertex

<S

We can name it with a number (or letter) on the inside of the angle

<1

We cannot name it angle R  because the point R is not  the vertex of an angle

2.83941151 would be the answer you're looking for! : )

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.