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Mathematics LibreTexts

10.1: Plane

  • Page ID
    21640
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    Area (A) is measured in square units, perimeter (P) is measured in units, and circumference (C) is measured in units.

    Square

    Screenshot (282).png
    Figure 10.1.1

    \[P=4 s \]

    \[A=s^{2}\]

    Rectangle

    Screenshot (283).png
    Figure 10.1.2

    \[P=2 l+2 w \]

    \[A=l w\]

    Parallelogram

    Screenshot (284).png
    Figure 10.1.3

    \[P=2 a+2 b\]

    \[A=b h\]

    Trapezoid

    Screenshot (285).png
    Figure 10.1.4

    \[P=a+b+c+d\]

    \[A=\frac{1}{2} h(a+b)\]

    Triangle

    Screenshot (286).png
    Figure 10.1.5

    \[P=a+b+c\]

    \[A=\frac{1}{2} b h\]

    Circle

    Screenshot (287).png
    Figure 10.1.6

    \[C=2 \pi \]

    \[r=\pi r^{2}\]