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2. File:Checking-understanding-of-perimeter-and-area-worksheet ...

   en.wikipedia.org/wiki/File:Checking...

   This file is licensed under the United Kingdom Open Government Licence v3.0.: You are free to: copy, publish, distribute and transmit the Information; adapt the Information; ...

3. File:Oak National Academy KS3 Maths- lesson-1-in-perimeter ...

   en.wikipedia.org/wiki/File:Oak_National_Academy...

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4. Area of a triangle - Wikipedia

   en.wikipedia.org/wiki/Area_of_a_triangle

   The area of a triangle can be demonstrated, for example by means of the congruence of triangles, as half of the area of a parallelogram that has the same base length and height. A graphic derivation of the formula T = h 2 b {\displaystyle T={\frac {h}{2}}b} that avoids the usual procedure of doubling the area of the triangle and then halving it.

5. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.

6. Shoelace formula - Wikipedia

   en.wikipedia.org/wiki/Shoelace_formula

   Shoelace scheme for determining the area of a polygon with point coordinates (,),..., (,). The shoelace formula, also known as Gauss's area formula and the surveyor's formula, [1] is a mathematical algorithm to determine the area of a simple polygon whose vertices are described by their Cartesian coordinates in the plane. [2]

7. California Assessment of Student Performance and Progress

   en.wikipedia.org/wiki/California_Assessment_of...

   The California Achievement Test, Sixth Edition (CAT/6), shows how well students are doing compared to students nationally in reading, language, spelling, and mathematics in grades 3 and 7 only. [ 2 ] California's school accountability system was originally based solely on scores from the CAT/6 .

8. Semiperimeter - Wikipedia

   en.wikipedia.org/wiki/Semiperimeter

   The area A of any triangle is the product of its inradius (the radius of its inscribed circle) and its semiperimeter: A = r s . {\displaystyle A=rs.} The area of a triangle can also be calculated from its semiperimeter and side lengths a, b, c using Heron's formula :

9. Area - Wikipedia

   en.wikipedia.org/wiki/Area

   The area of a plane region or plane area refers to the area of a shape or planar lamina, while surface area refers to the area of an open surface or the boundary of a three-dimensional object. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint ...