## RobotLAB Blog

### Everything You Need To Know About Robotics in Education and Businesses Check out these fun geometry facts for kids. Learn about circles, squares, triangles, spheres, cubes and many other interesting shapes! ## History Facts ...

- The word ‘geometry’ comes from the Greek words ‘geo’, meaning earth, and ‘metria’, meaning measure

- Greek philosopher and mathematician Pythagoras lived around the year 500 BC and is known for his Pythagorean theorem relating to the three sides of a right angle triangle: a² + b² = c² ## Triangle Facts...

-The three internal angles of a triangle always add to 180 degrees

-The longest side of a right angle triangle is called the hypotenuse, it is always found opposite the right angle.

-Trigonometry is the study of the relationship between the angles of triangles and their sides.

-Triangle shapes are often used in construction because of their great strength. ## Sphere Facts...

All points on the surface of a sphere are the same distance from the center.

-The distance from the center of a sphere to its surface is called the radius.

-Sometimes a sphere is given a north and south pole (found on opposite sides of the surface).

-A sphere can be divided into two equal hemispheres by a flat two dimensional surface (plane) that passes through the center. ## Square Facts...

-A square is also a rectangle with equal sides and a rhombus with right angles.

-The perimeter of a square is 4 times the length of one side.

-The diagonals of a square bisect each other at 90 degrees and are perpendicular.

-The internal angles of a square add to 360 degrees. ## Circle Facts...

-In strict mathematical language, circle refers to the boundary of the shape while ‘disk’ is used to refer to the whole shape, including the inside.

-An arc is part of the circumference of a circle.

-A circle has the shortest perimeter of all shapes with the same area.

-All points on the edge of a circle are the same distance to the center.

-A chord is a straight line joining two points on a circle, the diameter is an example of a chord (the longest possible one). ## Curved 3D Shapes Facts...

-A torus is a three dimensional shape that looks like a donut, the inner tube of a tire and a lifebuoy used to help rescue people in water.

-A cone is a three dimensional object with a circular base that narrows toward a point, it looks similar to an ice cream cone.

-A cylinder is a three dimensional object with a circular base and straight parallel sides that looks similar to a can of coke.

-These three dimensional shapes feature curves, which you won't find on polyhedrons Check more Smart Fridays articles! and visit Engagek12 for amazing lessons with geometry! Check the original article here: http://www.kidsmathgamesonline.com/facts/geometry.html