75°+75°=150°
angles in a triangle add up to 180°
180°-150°=30°
c) x=30°
I believe it is 17.0, I hope this helps some
Answer: 131.1287 square mm (approx)
Step-by-step explanation:
The area of a triangle,

Where
and
are adjacent sides and
is the include angle of these sides,
Here PR and QR are adjacent sides and ∠R is the included angle of these sides,
Thus, we can write,
,
and
,
Thus, the area of the triangle PQR,


Answer:
See below:
Step-by-step explanation:
Hello! We can check to see if the inequality is true by replacing r with 18 as we have been told to find them in which 18 as r makes the equation true.
So our equations to test for are:

We can input 18 as r and then we see the following are correct:
1. No, as a -21 is not greater than -6
2. Yes, as -15 is less than 6.
3. No, as 21 is not greater than 6
4. No, as -15 is not greater than 6.
Cheers!