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Black holes – Space science – Physics

By |2018-05-31T11:49:29+00:00August 17th, 2017|Physics|

Ripples A black hole is a place in space where there is a huge amount of mass in a very small area. Because gravity is the same as mass times 1/volume, when you have a lot of mass in a small volume it makes a lot of gravity. Apparently, it makes so much gravity that even light can't get away from the black hole! [...]

What is area? Simple geometry

By |2017-07-29T13:29:39+00:00July 29th, 2017|Math|

Calculating the area of your room. The area of a room is the size of the floor. Suppose you wanted to find out whether your room was really bigger than your brother's room. You'll need to measure your room, and his room. Suppose your room is ten feet long and fifteen feet wide, [...]

What is a trapezoid? Simple geometry

By |2017-07-29T13:16:13+00:00July 29th, 2017|Math|

This is a trapezoid. A trapezoid is a kind of quadrilateral that has at least two sides that are parallel to each other. A parallelogram is a trapezoid that has two pairs of parallel sides, and a rhombus is a special kind of parallelogram, and so are rectangles and squares. To figure out the perimeter of a trapezoid, you can add the lengths of [...]

Area of a sphere – Volume of a sphere

By |2017-07-29T13:10:50+00:00July 29th, 2017|Math|

This is a sphere. A sphere is a three-dimensional circle. Or you could say that a sphere is the set of all the points that are at the same distance from the center of the sphere. In nature, centrifugal force and gravity tend to make a lot of things into spheres: soap bubbles, for instance, atoms, and planets. The radius of a sphere [...]

What is a rhombus? Simple geometry

By |2018-04-23T16:01:48+00:00July 29th, 2017|Math|

This is a rhombus, divided so you can figure out the area. A rhombus is a kind of quadrilateral that has two sides that are parallel to each other, and another two sides that are parallel to each other. A rhombus is a special kind of parallelogram, and squares and rectangles are special kinds of rhombus. To figure out the perimeter of the rhombus, you [...]

What is a pyramid? Square pyramids

By |2017-07-29T11:57:36+00:00July 29th, 2017|Math|

A pyramid with a square base. A pyramid is a three-dimensional solid form made out of triangles. Some pyramids also use a square. There are two common kinds of pyramids: triangular pyramids that you make by fitting four triangles together, and square pyramids that you make by fitting four triangles together on a square base, like the [...]

What is a prism? Rectangular and triangular prisms

By |2017-07-29T11:53:44+00:00July 29th, 2017|Math|

This is a triangular prism A prism is the solid shape you get if you move a flat polygon through space. A prism has five planes: a top, a bottom, and three sides. The most common kind of prism is a rectangular prism, made by moving a quadrilateral through space: a cube is a common example of a [...]

What is an isosceles triangle? Simple geometry

By |2017-07-29T10:02:57+00:00July 29th, 2017|Math|

This is an isosceles triangle. Isosceles triangles have at least two sides that are exactly the same length. This forces two of their angles to also be acute angles of exactly the same size. In this blue triangle, the two longer sides are the same length, which forces the two bottom angles to be the same size. If the [...]