Answer: A hope it helps
Step-by-step explanation:

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step by step explanation </h3>
● area of regular polygon Formulas ,
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● now finding the area of regular polygon,
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Hope it's helps you
Answer:
C.
Step-by-step explanation:
Recall that the sum of the (3) interior angles of a triangle <em>must</em> equate to 180.
In other words:

Where x is our unknown angle. So, we need to solve for x.
On the left, add 55 and 20:

Subtract 75 from both sides. The left side cancels:

Therefore, the third angle is 105 degrees.
Our answer is C.
1b,
2b,
3a, which grade is this?