first multiply 23 by 2 (23x2), which gives us 46, then subtract that from 66 (66-46), which gives us 20, and divide that by 2 (20/2) and you get 10. hope this helps
Answer:
The reference angle is 
Step-by-step explanation:
The given angle is
The reference angle is the acute angle, that a given angle makes with the x-axis.
First let us make a sketch of the given angle. <em>See diagram in attachment.</em>
Let
be the reference angle of 
Then, from the diagram, we need to subtract
from
to get to
.
We can therefore write the following equation and solve for
.

We group like terms to get,

We collect LCM to get,

We simplify to get,

We divide through by 
to get,
The correct answer is D.
The area is 11.7 ft^2
good luck
He can make 15 chess boards.
All you need to do is multiply 3 by 5.
Here is the solution which make everything clear.
As you can see, according to given AM=ZDand M=angleDMD=MD is the common one. Due to to this, you can recognize Side-Angle-Side and get the answer : <span>C. SAS
Do hope it will help you!</span>