Finding Area of Irregular Shapes

​Finding Area of Irregular Shapes

You will use these areas to help make decisions on your ZOO PROJECT.

Do the work on the white board tables, take a pic of your work from each

problem and upload to each answer.

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What is the Area of the Semi-Circle?

(Remember to use 3.14 as $$\pi$$ )

$$A\ =\ \frac{\pi r^2}{2}$$

Round to the nearest whole number

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What is the Area of the Trapezoid?

Formula:

$$A\ =\frac{\left(b_1+\ b_2\right)h}{2}$$

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What is the Area of the Regular Polygon?

Formulas:

$$P=\ 5s,\ and\ A\ =\ \frac{Pa}{2}$$

Round to the nearest hundredth if necessary

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What is the Area of the Regular Polygon?

Formulas:

$$P\ =\ 6s,\ \ and\ A\ =\ \frac{Pa}{2}$$

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What is the Area of the Regular Polygon?

Formulas:

$$P\ =\ 8s,\ \ and\ A\ =\ \frac{Pa}{2}$$

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What is the Area of the Irregular Shape?

Formulas:

$$\left(SEMI-CIRCLE\right)\ A=\ \frac{\pi r^2}{2},\ \ and\ \left(RECTANGLE\right)\ A\ =\ lw$$ Round to the nearest hundredth if necessary

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What is the Area of this Shape?

Formula

$$A\ =\ \pi r^2\left(\frac{3}{4}\right)$$

Round to the nearest whole number

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What is the Area of the Irregular shape?

Remember: Draw lines to make multiple shapes

Formula:

$$\left(RECTANGLE\right)\ A\ =\ lw$$

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What is the Area of the Irregular Shape?

Find the areas of the individual shapes, then add them all together.

Formulas:

$$\left(TRIANGLE\right)\ A\ =\ \frac{bh}{2}$$

$$\left(RECTANGLE\right)\ A\ =\ lw$$ $$\left(SEMI-CIRCLE\right)\ A\ =\ \frac{\pi r^2}{2}$$

Round to the nearest whole number

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What is the Area of the Irregular Shape?

Formulas

$$\left(SEMICIRCLE\right)\ A\ =\ \pi r^2\left(\frac{3}{4}\right),\ \left(RECTANGLE\right)\ A\ =\ lw$$ Round to the nearest whole number