A 9-sided "circle" is an nonagon or enneagon.
In a circle that has a radius of one you use Pythagorean theorem to derive the sine, cosine and tangent formulas. Draw a circle around the origin on graph paper. The sine is the line segment from the point where the side of the angle intersects down to the x-axis. etc.
A striaght line , outside the circle, that just touches the circle in one place.
a semi-circle only has one line of symmetry
A Tangent is a straight line, outside the circle, that just touches the circle circumference in one place. A Chord is a straight line , inside the circle, but not passing throught the centre. and touches the circle circumference in two place.
The Arc of a circle is that part of the circumference between two radii.
You just hold down alt and press 9 on the right side ○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○○
Being half of the circumference of a circle, a semi circle has one side
The circumference of a 9 circle is: 28.3
If the diameter of a circle is 9 the circumference is: 28.3
If a circle has a circumference of 9, the diameter is: 2.864
A square whose diagonal is the diameter of the circle. So, if it is a circle with diameter 18 units then the diagonal of the square is 18 units and so its side is 9*sqrt(2) = 12.7 units.
The diameter of a circle is twice the radius. A circle with a radius of 9 would have a diameter of 18. (9*2=18).
the right side
A circle has 1 side.Yes a circle has one round side
a circle only have 1 side
A line. Or a circle
A nonagon or enneagon is a nine- sided polygon or 9-gon. Nonagon = Nona + gon where Nona means nine and gon means sides.