Question

Find the perimeter of a parallelogram and one semicircle

Answer 1

1. For semicircle examples, skip to section 1
2. For parallelogram examples, skip to section 2

To find the perimeter of a parallelogram, use the formula, 2(a+b)

To find a semicircle perimeter, use the formula of (π × r) + (2 × r)

note that without any specified values for the shapes, you cannot properly find a value.

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1.
`\sf Semicircles`

So let's say I have a bowl that is ironically shaped like a semicircle, and its radius is 6 units.

• What we know is that the semicircle has a radius of 8 units, and what we must find is the perimeter.

• So let's solve.

Use the formula from earlier.(Using 3.14 for pi)

`(\pi *r)+(2*r)`

`=\pi * r(8) + 2 * r(8) = 41.12`

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2.
`\sf Parallelograms`

And let's say I have a new origami shape that contains a figure similar to a parallelogram. We want to find it's perimeter. What is the first step?

• The first step is using the parallelogram perimeter formula as listed below and above.

`2(a+b)`

Where a is the side and b is the base.

• And let's also say this figure has a base of 7 and a side of... let's say a side length of 9
• Now that we have values, use the formula to solve.

`2*(7+9) = 32`

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`\sf Questions`

If you have any questions, please reach out via the comments. I hope this helps, and have a great day!