perimeter

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29 07, 2017

What is a triangle? Simple geometry

By |2017-07-29T13:19:10-07:00July 29th, 2017|Math|0 Comments

This is an equilateral triangle. A triangle is any set of three points on a plane and the lines connecting those points to each other, as long as the three points aren't all on the same line (that would just be a line). Or, you could think of a triangle as the part of the plane that lies [...]

29 07, 2017

What is a trapezoid? Simple geometry

By |2017-07-29T13:16:13-07:00July 29th, 2017|Math|0 Comments

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 [...]

29 07, 2017

Right triangle – Simple geometry

By |2017-07-29T13:00:51-07:00July 29th, 2017|Math|0 Comments

This is a right triangle, because one of the angles is a right angle. A right triangle is any triangle where one of the angles is exactly 90 degrees, or a right angle. You can't have more than one 90 degree angle in a triangle, or it would be a rectangle. In a right triangle, the side opposite [...]

29 07, 2017

What is a rhombus? Simple geometry

By |2018-04-23T16:01:48-07:00July 29th, 2017|Math|0 Comments

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 [...]

29 07, 2017

Rectangle – area and perimeter

By |2018-04-23T16:01:22-07:00July 29th, 2017|Math|0 Comments

This is a rectangle. A rectangle is a flat shape, in one plane. It's defined by four points at the four corners. A rectangle has two sides of equal length opposite each other, and two other sides of equal length opposite each other, and four corners, all right angles (90 degree angles). A square is a special kind of rectangle. [...]

29 07, 2017

What is a prism? Rectangular and triangular prisms

By |2017-07-29T11:53:44-07:00July 29th, 2017|Math|0 Comments

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 [...]

29 07, 2017

What is pi? Simple geometry – Math, circles, circumference, diameter

By |2018-04-23T16:01:03-07:00July 29th, 2017|Math|8 Comments

What is pi? The geometry of a circle What is pi? Pi is a number that is just a little bigger than 3.14. It is the number you get if you divide the circumference of any circle by its diameter. It's the same for all circles. You can approximate pi for yourself by taking some circular things like the tops [...]

29 07, 2017

What is a perimeter? – Simple geometry

By |2017-07-29T11:39:51-07:00July 29th, 2017|Math|0 Comments

The perimeter of this rectangle is in dark green. The perimeter of a square or a triangle is the distance all the way around the edge - the green strip in this picture. The circumference of a circle is also its perimeter. The perimeter of a quadrilateral, like a square or a rectangle, is always equal to twice the length plus [...]

29 07, 2017

What is an isosceles triangle? Simple geometry

By |2019-10-07T18:17:58-07:00July 29th, 2017|Math|0 Comments

This is an isosceles triangle. Definition of 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. What is a triangle? More geometry All our math articles In this blue triangle, the two longer sides are the [...]

29 07, 2017

What is a hexagon? Simple geometry

By |2019-08-13T22:11:41-07:00July 29th, 2017|Math|0 Comments

This is a hexagon. See, it has six sides that are all the same length. Definition of a hexagon A hexagon is a flat shape, all in one plane, with six sides all of equal length. Each of the six angles measures 120 degrees, so the total interior angles of this shape measure 720 degrees [...]