# لغات انگلیسی مربوط به ریاضیات (o-z) 2 – 1 obtuse angle
زاویه باز
An obtuse angle is greater than ninety degrees octagon
هشت ضلعی
An octagon is an eight-sided figure. Stop signs are octagons octahedron
هشت وجهی
An octahedron is an eight-sided geometric solid

…1,3,5,7,9,11

odd number
عدد فرد
An odd number is not divisible by two one
یک
One is a small number

1/2

one half
یک دوم، نصف
When something is divided into two equal parts, each of these two parts is one half of the original object orb
کره
A ball-shaped object is an orb oval
بیضی
An oval is an egg-shaped figure parallel
موازی
Parallel lines extend in the same direction, are always the same distance apart, and never meet parallelogram
متوازی الاضلاع
A parallelogram is a four-sided figure whose opposite sides are parallel pattern
الگو
A pattern is something that is repeated pentagon
پنج ضلعی
A pentagon is a five-sided figure perimeter
محیط
Perimeter is the distance around the edges of a figure. For example, the perimeter of a square with side length of a is a+a+a+a=4 times a perpendicular
عمود
When two lines are perpendicular, they are at right angles (90 degrees) pi
(عدد)پی(نسبت محیط دایره به قطر آن که این نسبت در تمام دایره ها مساوی و تقریبا" برابر 3.14159 است.)
Pi is the ratio of the circumference of a circle to the diameter of a circle (this ratio is the same for any size circle). Pi is roughly equal to 3.14159 pie chart
نمودار دایره ای
A pie chart (also called a circle graph) is a diagram that is useful for displaying information about the percentages or parts of a whole

.

point
نقطه
A point is an exact location, a spot with no width or thickness polygon
شکل چند گوشه، کثیر الاضلاع
A polygon is a many-sided figure with straight edges polyhedron
شکل دارای وجوه متعدد(معمولا" بیش از شش سطح رامی گویند.)
Polyhedra are solids whose faces are polygons

…..2,3,5,7,11,13,17

prime number
عدد اول
A prime number is a positive number that has exactly two factors, 1 and itself. Alternatively, you can think of a prime number as a number greater than one that is not the product of smaller numbers. For example, 13 is a prime number because it can only be divided evenly by 1 and 13. For another example, 14 is not a prime number because it can be divided evenly by 1, 2, 7, and 14. The number one is not a prime number because it has only one factor, 1 itself protractor
نقاله
A protractor is a device that measures angles pyramid
هرم
A pyramid is a shape that has a flat polygonal base and triangular sides that meet at a point on the top. The pyramids in Egypt are huge buildings build by ancient Egyptians