Here are formulas for area and perimeter of geometric shapes together. Note the formulas, which is in the gray areas. They are just going to pull over in GeoGebra.
Circle
The area A of a circle:
A = π • \(R 2 )
The circumference(Perimeter) O of a circle:
O = 2 • r • π
Areal=π*r^2 Omkreds=2*r*π
Pie Slice
The area A of a pie
A = \(\frac{1}{2}\) • \(R 2 ) • \(\theta)
\(\theta) in radians. (see conversion)
Arc length = r • \(\theta)
Angle in radians
Areal=0.5*r^2*v buelængde= r * v
Angle in degrees
Area = 0.5 * r^2 * (v * π/180) Arc length = r * (v * π/180)
Arc Segment
The area A of the green area (circle section):
A = \(\frac{1}{2}\) • \(R 2 ) • (\(\theta) – its (\(\theta))
\(\theta) in radians. (see conversion)
Angle in radians
Area = 0.5 * r ^ 2 *(v - its(v))
Angle in degrees
Area = 0.5 * r ^ 2 *((v * π/180) - its((v * π/180)))
Annulus
The area A of the green area (annulus):
A = π • ( \(R ^ 2 ) – \(R 2 ))
A = π *(R ^ 2-r ^ 2)
Ellipse
Area A of the ellipse:
A = π • a • b
Circumference O of the ellipse:
O = 2 • n • \(\sqrt[]{ \frac{1}{2} \cdot (a^2 b^2) } \)
Area = π * a * b Omkreds= 2*π*sqrt(0.5*(a ^ 2 b ^ 2))
Rectangle
A rectangle is a square, Who 4 pages, which are mutually equal and all interior angles is 90 degrees.
Area A of the rectangle
A = l • b (length times width)
Circumference O of rectangle
O = 2 • l + 2 • b
Area = L * b Omkreds = 2*l + 2*b
Square
A square is a square, Who 4 equal sides and all interior angles is 90 degrees.
A square area of
A = \(s^2) (s = side length)
Circumference O of square
O = 4 • s
Areal = s^2 Omkreds = 4*s