21.4
0.5*apothegm*perimeter = 0.5*3*20 = 30 sq feet
15 ft.
Area of regular polygon: 0.5*3*20 = 30 square feet
The circumference of a circle is the same as the perimeter of a circle, so the perimeter and circumference would both be 3 ft.
3 cm x 6 sides = 18 cm perimeter
21.4
15 ft.
0.5*apothegm*perimeter = 0.5*3*20 = 30 sq feet
3 times the square root of 3
12(radical "3")
A regular octagon has 8 sides so if each side is 3 1/2 inches long then the perimeter is just 8*(3 1/2 inches) or 28 inches
Draw incircle and circumcircle. radius of incircle = 6 radius of circumcircle = 6 × 2/√3 = 12/√3 (side opposite to 60° is √3/2 times hypotenuse. consider right angled triangle formed by these two radius and 1/2 side of hexagon. (1/2 side)² = (12/√3)² - 6² = 12 1/2 side = √12 full side of hexagon = 2√12, perimeter = 12√12 Area = 1/2 a × perimeter = 1/2 × 6 × 12√12 = 36√12 = 72√3 unit²
A regular pentagon has a perimeter of 5s. We set this equal to 15, and solve for s, and convert to yards.5s = 15s = 33 feet converted to yards is 3/3 = 1 yard.
Using trigonometry and the sine rule the area of the regular 5 sided pentagon with a perimeter of 50cm works out as 172.048 square cm rounded to 3 decimal places.
Area of regular polygon: 0.5*3*20 = 30 square feet
The circumference of a circle is the same as the perimeter of a circle, so the perimeter and circumference would both be 3 ft.