The answer is D, this is because 9 times 12 times 18 equals to 1944 that times 1/2 basically means divided by two if you divide 1944 by 2 you get 972.
I’m pretty sure it’s 20 could be wrong
It's 54 degrees.
The internet is a wonderful friend. Type in "Pentagon split into triangles" on google images and you will find a diagram that finds it.
<u>Answer:</u>
<u>Step-by-step explanation:</u>
The sum of interior angles of a quadrilateral is 360°.
If we consider the measure of one of the unknown angles to be 
°, we can set up the following equation:
Now we can solve for :
⇒ 
⇒ 
[subtracting 192° from both sides]
⇒ 
⇒ 
[dividing both sides by 2]
⇒ 
Therefore, the other two angles each have a measure of 84°.
