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2. Equable shape - Wikipedia

   en.wikipedia.org/wiki/Equable_shape

   An area cannot be equal to a length except relative to a particular unit of measurement. For example, if shape has an area of 5 square yards and a perimeter of 5 yards, then it has an area of 45 square feet (4.2 m 2) and a perimeter of 15 feet (since 3 feet = 1 yard and hence 9 square feet = 1 square yard).

3. Perimeter - Wikipedia

   en.wikipedia.org/wiki/Perimeter

   A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference. Calculating the perimeter has several practical applications. A calculated perimeter is the length of fence required to surround a yard or garden.

4. Goat grazing problem - Wikipedia

   en.wikipedia.org/wiki/Goat_grazing_problem

   Goat grazing problem. The goat grazing problem is either of two related problems in recreational mathematics involving a tethered goat grazing a circular area: the interior grazing problem and the exterior grazing problem. The former involves grazing the interior of a circular area, and the latter, grazing an exterior of a circular area.

5. Congruence (geometry) - Wikipedia

   en.wikipedia.org/wiki/Congruence_(geometry)

   Congruence permits alteration of some properties, such as location and orientation, but leaves others unchanged, like distances and angles. The unchanged properties are called invariants. In geometry, two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other.

6. Project Mathematics! - Wikipedia

   en.wikipedia.org/wiki/Project_Mathematics!

   The Project Mathematics! series of videos is a teaching aid for teachers to help students understand the basics of geometry and trigonometry. The series was developed by Tom M. Apostol and James F. Blinn, both from the California Institute of Technology. Apostol led the production of the series, while Blinn provided the computer animation used ...

7. Fin (extended surface) - Wikipedia

   en.wikipedia.org/wiki/Fin_(extended_surface)

   Fin (extended surface) In the study of heat transfer, fins are surfaces that extend from an object to increase the rate of heat transfer to or from the environment by increasing convection. The amount of conduction, convection, or radiation of an object determines the amount of heat it transfers. Increasing the temperature gradient between the ...

8. Square - Wikipedia

   en.wikipedia.org/wiki/Square

   Square. In Euclidean geometry, a square is a regular quadrilateral, which means that it has four sides of equal length and four equal angles (90- degree angles, π/2 radian angles, or right angles). It can also be defined as a rectangle with two equal-length adjacent sides.

9. Circumference - Wikipedia

   en.wikipedia.org/wiki/Circumference

   v. t. e. In geometry, the circumference (from Latin circumferens, meaning "carrying around") is the perimeter of a circle or ellipse. [1] The circumference is the arc length of the circle, as if it were opened up and straightened out to a line segment. [2] More generally, the perimeter is the curve length around any closed figure.