Chapter 9

Chapter 9

Area of Figures​

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Area of a rectangle and triangle:

​To find the area of a rectangle, you need to multiply the Length times Width.

Area of Square = Length X Width

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Since a triangle is half of a rectangle, to find the area of a triangle you need to do 1/2 Length X Width

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Area of Triangle = 1/2 Length X Width​

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Area of a Trapezoid

Ex: Find the area of the trapezoid with bases length 2 and 5 and height 10.​

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​Ex: Find the area of the composite figure:

​A. Find the area of the composite figure:

Area of a Circle

​Radius: The radius is the line that goes halfway through the circle.

Diameter: The diameter is the line that goes all the way through the circle.

Pi: Pi is a ratio of circumference divided by diameter and is approximated by 3.14.

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​Ex: Find the area of the circles

​A. Find the area of the circle

The area of a circle is 64π​, what is the radius?

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What is the perimeter of a square whose area is 36 cm²?

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A rectangle has perimeter 70 and length 32. What is the area of the rectangle?

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A circle has diameter with endpoints (-2,5) and (4,-3). What is the area in terms of pi?

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Find the area of the shaded region:​

​Find the area of the shaded region: