安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- Perimeter - Wikipedia
A perimeter is the length of a closed boundary that encompasses, surrounds, or outlines either a two-dimensional shape or a one-dimensional line The perimeter of a circle or an ellipse is called its circumference
- List of formulas in elementary geometry - Wikipedia
Perimeter#Formulas – Path that surrounds an area List of second moments of area List of surface-area-to-volume ratios – Surface area per unit volume List of surface area formulas – Measure of a two-dimensional surface List of trigonometric identities List of volume formulas – Quantity of three-dimensional space
- Elementary mathematics - Wikipedia
Basic two-dimensional geometry Two-dimensional geometry is a branch of mathematics concerned with questions of shape, size, and relative position of two-dimensional figures Basic topics in elementary mathematics include polygons, circles, perimeter and areas
- Circumference - Wikipedia
Circumference = π × diameter = 2 π × radius In geometry, the circumference (from Latin circumferēns 'carrying around, circling') is the perimeter of a circle or ellipse The circumference is the arc length of the circle, as if it were opened up and straightened out to a line segment [1] More generally, the perimeter is the curve length around any closed figure Circumference may also
- Equable shape - Wikipedia
Equable shape Every equable triangle has an inradius of 2 [1][2] A two-dimensional equable shape (or perfect shape) is one whose area is numerically equal to its perimeter [3] For example, a right angled triangle with sides 5, 12 and 13 has area and perimeter both with a unitless numerical value of 30
- I interviewed two dozen teenagers — this is what they all . . .
Teens want what they want — and we've got the inside scoop on gifts that sleigh I spoke with two dozen Gen Z and Gen Alpha folks about their wish lists to round up the best gifts for teens for
- Perimeter of an ellipse - Wikipedia
An ellipse has two axes and two foci Unlike most other elementary shapes, such as the circle and square, there is no closed-form expression for the perimeter of an ellipse Throughout history, a large number of closed-form approximations and expressions in terms of integrals or series have been given for the perimeter of an ellipse
- Geometry - Wikipedia
Geometry[a][1] is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures [2] Geometry is, along with arithmetic, one of the oldest branches of mathematics A mathematician who works in the field of geometry is called a geometer
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