Measurement

Lesson

Let's review the rules for areas of quadrilaterals, triangles and circles that we have covered so far.

Areas

Rectangle |
$\text{Area of a Rectangle }=\text{length }\times\text{width }$Area of a Rectangle =length ×width $A=L\times W$ |

Square |
$\text{Area of a Square}=side\times side$Area of a Square= $A=S\times S$ $A=S^2$ |

Triangle |
$\text{Area of a triangle }=\text{half of the area of the rectangle with base and height the same as triangle }$Area of a triangle =half of the area of the rectangle with base and height the same as triangle $\text{Area of a triangle }=\frac{1}{2}\times\text{base }\times\text{height }$Area of a triangle =12×base ×height $A=\frac{1}{2}bh$ |

Parallelogram |
$\text{Area of a Parallelogram }=\text{Base }\times\text{Height }$Area of a Parallelogram =Base ×Height $A=b\times h$ |

Trapezium |
$\text{Area of a Trapezium}=\frac{1}{2}\times\left(\text{Base 1 }+\text{Base 2 }\right)\times\text{Height }$Area of a Trapezium=12×(Base 1 +Base 2 )×Height $A=\frac{1}{2}\times\left(a+b\right)\times h$ |

Kite |
$\text{Area of a Kite}=\frac{1}{2}\times\text{diagonal 1}\times\text{diagonal 2}$Area of a Kite=12×diagonal 1×diagonal 2 $A=\frac{1}{2}\times x\times y$ |

Rhombus |
$\text{Area of a Rhombus }=\frac{1}{2}\times\text{diagonal 1}\times\text{diagonal 2}$Area of a Rhombus =12×diagonal 1×diagonal 2 $A=\frac{1}{2}\times x\times y$ |

Circle |
$\text{Area of a circle}=\pi r^2$Area of a circle=π |

Find the area of the rectangle shown.

Find the area of the parallelogram shown.

Find the shaded area shown in the figure.