Pentagon
Calculate the area of a regular pentagon whose diagonal is u=18 long.
Correct answer:
Tips for related online calculators
See also our right triangle calculator.
Do you want to round the number?
See also our trigonometric triangle calculator.
Do you want to round the number?
See also our trigonometric triangle calculator.
You need to know the following knowledge to solve this word math problem:
- arithmetic
- rounding
- planimetrics
- right triangle
- polygon
- area of a shape
- triangle
- goniometry and trigonometry
- sine
- cosine
- tangent
Units of physical quantities:
Grade of the word problem:
We encourage you to watch this tutorial video on this math problem: video1
Related math problems and questions:
- Diagonals of pentagon
Calculate the diagonal length of the regular pentagon: a) inscribed in a circle of radius 12dm; b) a circumscribed circle with a radius of 12dm. - Regular hexagonal prism
Calculate the volume of a regular hexagonal prism whose body diagonals are 24cm and 25cm long. - Parallelogram
Calculate the area and perimeter of a parallelogram whose two sides are long a=18 cm b=14 cm and height ha = 2 cm long. - Pentagon
Calculate the length of a regular pentagon's side, circumference, and area, inscribed in a circle with a radius r = 6 cm.
- Inscribed and described circle
Find the radii of a circle inscribed and circumscribed by a regular pentagon whose side measures 3 cm. - Quadrangular pyramid
Calculate the surface area and volume of a regular quadrangular pyramid: sides of bases (bottom, top): a1 = 18 cm, a2 = 6cm angle α = 60 ° (Angle α is the angle between the sidewall and the base plane.) S =? , V =? - Regular 5-gon
Calculate the area of the regular pentagon with side 16 cm.
