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Geometry Vocabulary

Across
The vertex the angle is on the circle and the sides of the angle are chords of the circle.
Lines that lie in the same plane and do not intersect. They are always going straight and never turn.
The space between two rays with the same endpoint. It can measure up to 180 degrees.
A three-dimensional figure with a circular base and curved lateral surface. The volume formula is πr2(h/3)
The intersection of a solid and a plane. It can be vertical, horizontal, slanted, or tangent.
A probability that uses a geometric model in which points represent outcomes. It usually involves area of shapes.
A polygon with three sides and three angles. The angles add up to 180 degrees.
A triangle that has at least two congruent sides. It also has at least two congruent angles which are called base angles.
The trigonometric ratio of the opposite side divided by the length of the adjacent side. It is only found in a right triangle.
Down
The trigonometric ratio of the side opposite of a given angle to the hypotenuse. It is only found in a right triangle.
Derived by measure of the arc/360 and the circumference of the circle. It cannot be 0.
Lines that intersect and form right angles. The lines usually intersect at one point.
The distance around a circle. The formula is 2πR.
A set of three nonzero numbers that satisfy the equation a2+b2=c2. It is only found in right triangles.
A segment whose endpoints are on the circle. It may or may not pass through the center of the circle.
A secant is a line that intersects a circle at two points. It may also be a segment or a ray.
The trigonometric ratio of the side adjacent to an acute angle to the hypotenuse. It is only found in a right triangle.
A three-dimensional shape with two congruent circular bases. The formula is πr2h.
A straight line from the center to the circumference of a circle or sphere. It is also half of the length of the diameter.
The distance from the center to a side in a regular polygon. Part of the 1/2ap formula.