What is the area of a regular nonagon with a radius of 14 in

To find the area you multiply all the sides so 14 * 9 ?? No.. wrong, not in answer options what am i doing wrong Dx

70.9 in.²
141.7 in.²
566.9 in.²
1,211.6 in.²

SECOND QUESTION:

What is the area of a regular 15-gon with a perimeter of 90 m?

How do I solve these two questions...

Help explain, please

1. What is the area of the regular pentagon below?

(1 point)
(1 pt) 688.2 ft²
(0 pts) 850.7 ft²
(0 pts) 951.1 ft²
(0 pts) 1,376.4 ft²
0 /1 point
2. What is the area of the regular octagon below?

(1 point)
(0 pts) 114.5 m²
(1 pt) 229.1 m²
(0 pts) 391.1 m²
(0 pts) 458.2 m²
0 /1 point
3. What is the area of the triangle below?

(1 point)
(0 pts) 6.0 ft²
(1 pt) 8.6 ft²
(0 pts) 15.0 ft²
(0 pts) 17.2 ft²
0 /1 point
4. What is the area of a regular nonagon with a radius of 14 in.? (1 point)
(0 pts) 70.9 in.²
(0 pts) 141.7 in.²
(1 pt) 566.9 in.²
(0 pts) 1,211.6 in.²
0 /1 point
5. What is the area of a regular 15-gon with a perimeter of 90 m? (1 point)
(0 pts) 528.2 m²
(1 pt) 635.1 m²
(0 pts) 1,270.3 m²
(0 pts) 142,903.1 m²
1 /1 point