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navik [9.2K]
3 years ago
8

Calculate the area of the composite figure.

Mathematics
2 answers:
Arisa [49]3 years ago
8 0

Check the picture below.

eduard3 years ago
5 0

Answer:

115.5 square inches.

Step-by-step explanation:

We have been given a composite figure. We are asked to find the area of our given composite figure.

We can see that our given figure consists a rectangle and a triangle.

\text{Area of composite figure}=\text{Area of rectangle}+\text{Area of triangle}

\text{Area of rectangle}=\text{Length}\times \text{ width}

\text{Area of rectangle}=(20-7)\text{ in}\times 7\text{ in}

\text{Area of rectangle}=13\text{ in}\times 7\text{ in}

\text{Area of rectangle}=91\text{ in}^2

\text{Area of triangle}=\frac{1}{2}(\text{Base length}\times\text{Height}

\text{Area of triangle}=\frac{1}{2}(7\text{ in}\times7\text{ in}

\text{Area of triangle}=\frac{1}{2}(49\text{ in}^2)

\text{Area of triangle}=24.5\text{ in}^2

\text{Area of composite figure}=91\text{ in}^2+24.5\text{ in}^2

\text{Area of composite figure}=115.5\text{ in}^2

Therefore, the area of our given composite figure is 115.5 square inches.

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To determine which number produces an irrational number when multiplied by 0.4

First and foremost, 0.4 is a rational number.

A rational number is a number that is of the form \frac{p}{q} where p and q are integers and q is not equal to 0.

0.4 can be written as \frac{4}{10} or \frac{2}{5}, hence, it is a rational number.

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Any irrational number when multiplied by a rational number other than zero will also be irrational.

Therefore, we are to determine which of the given options is an irrational number.

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π is an irrational number, therefore 3π is also an irrational number

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\frac{2}{7} is a rational number

The only irrational number among the given options is 3π

Hence, the number that produces an irrational number when multiplied by 0.4 is 3π. The correct option is A. 3\pi

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