https://www.khanacademy.org/...area...perimeter/...area/.../intuition-for-area- of-a-parallelogram

Understand why the formula for the **area** of a parallelogram is base times height,

just ... **2**. A parallelogram is defined as a shape with **2** sets of parallel sides, so

this ... why **area** gets smaller if you transform rectangle into parallelogram with

**same** ... In **other** parallelograms this does not hold true and the height is **different**

from ...

https://en.wikipedia.org/wiki/Heron%27s_formula

In geometry, Heron's formula (sometimes called Hero's formula), named after

Hero of Alexandria, gives the **area** of a triangle when the length of all three sides

are known. Unlike **other** formulas, there is no need to calculate **other** distances in

the triangle first. Contents. 1 Formulation; **2** Example; 3 History; 4 Proofs ...

Heron's formula states that the **area** of a triangle whose sides have lengths a, ...

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