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Lower kindergarten

Shapes

Circle

A circle is a shape consisting of all points in a plane that are a given distance from a given point, the center; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant. Area: π× (radius)²Circumference: 2π x radius Diameter: 2 x radius Number of vertices: 0Number of edges: 0

Rectangle

A rectangle is a four-sided shape where every angle is a right angle (90°). Also opposite sides are parallel and of equal length

In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal. It can also be defined as a parallelogram containing a right angle.  length× width Perimeter: 2 x (length +width )Number of vertices: 4Number of edges: 4Internal angle: 90°

Triangle

A triangle has three sides, three vertices, and three angles. The sum of the three interior angles of a triangle is always 180°. The sum of the length of two sides of a triangle is always greater than the length of the third side.

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted. In Euclidean geometry, any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane. Area : ½ × base × height Perimeter: sum of side lengths of the triangle Number of vertices: 3Number of edges: 3Internal angle: 60° (for equilateral)

Square

A square is a special case of many lower symmetry quadrilaterals: A rectangle with two adjacent equal sides. A quadrilateral with four equal sides and four right angles. A parallelogram with one right angle and two adjacent equal sides.

In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or 100-gradian angles or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices

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