How to find the perimeter of a figure - HSPT Math

Card 1 of 524

0

Didn't Know

0

Didn't Know

Knew It

0

1 of 2019 left

Question

The length of a rectangle is two times as long as the width. The width is equal to inches. What is the perimeter of the rectangle?

Tap to reveal answer

Answer

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the triangle below?

Tap to reveal answer

Answer

To find the perimeter of a triangle, we add all of the side lengths together.

← Didn't Know|Knew It →

Question

What is the perimeter of the regular pentagon below?

Tap to reveal answer

Answer

A regular pentagon has five equal sides. To find the perimeter of a pentagon, we can multiply the known side length by (since there are five sides) or we can add the known side length to itself five times.

$2\times5=10$

← Didn't Know|Knew It →

Question

The perimeter of the above square is 40% of what number?

Tap to reveal answer

Answer

The perimeter of a square with sides of length 12 is 4 times this, or

$12 \times 4 = 48$ .

The number of which 48 is 40% can be found by dividing 48 by 40%, or $\frac{40}{100}$ :

$48 \div \frac{40}{100} = 48 \times \frac{100}{40}= 120$ ..

← Didn't Know|Knew It →

Question

A rectangular garden has an area of $80: \mbox{m^2}$ . Its length is meters longer than its width. How much fencing is needed to enclose the garden?

Tap to reveal answer

Answer

We define the variables as $w = \mbox{width}$ and $l = \mbox{length} = w + 2$ .

We substitute these values into the equation for the area of a rectangle and get $A_{\mbox{rectangle} }= wl = w(w + 2) = 80$ .

or

Lengths cannot be negative, so the only correct answer is . If , then .

Therefore, $\mbox{perimeter }= 2w + 2l = 16 + 20 = 36:\mbox{m}$ .

← Didn't Know|Knew It →

Question

What is the circumference of a circle with a radius of 5?

Tap to reveal answer

Answer

The formula for circumference is $\dpi{100} \pi d$ or $\dpi{100} 2\pi r$ .

Since we are given the radius, we will use $\dpi{100} 2\pi r$ .

$\dpi{100} 2\pi r=2\pi (5)=10\pi$

← Didn't Know|Knew It →

Question

What is the perimeter of a square with a side length of 4?

Tap to reveal answer

Answer

The formula for the perimeter of a square is $\dpi{100} 4s$ , where $\dpi{100} s$ is the length of one side of the square.

So $\dpi{100} 4\cdot (4)=16$

← Didn't Know|Knew It →

Question

If the perimeter of a rectangle is 40, and the width of the rectangle is 8, what is the length of the rectangle?

Tap to reveal answer

Answer

The formula for the perimeter of a rectangle is $\dpi{100} P=2l+2w$ , where $\dpi{100} l$ is the length of the rectangle and $\dpi{100} w$ is the width.

Plug in the numbers that we are given into the equation.

$\dpi{100} 40=2l +2(8)$

$\dpi{100} 40=2l +16$

$\dpi{100} 40-16=2l +16-16$

$\dpi{100} 24=2l$

$\dpi{100} \frac{24}{2}=\frac{2l}{2}$

$\dpi{100} l=12$

← Didn't Know|Knew It →

Question

What is the perimeter of a rectangle with a base of 4 and a height of 8?

Tap to reveal answer

Answer

When searching for the perimeter of a rectangle we are looking for the sum of the lengths of all of the sides enclosing the figure. In this case there are four sides, two that are the base and two that are the height. To find the perimeter we add all four of them together.

Therefore the equation for the perimeter of a rectangle is

In this case the equation looks like this

Multiply the numbers together

Then add them to get the answer

← Didn't Know|Knew It →

Question

What is the height of a rectangle with a perimeter of 30 and base of 12?

Tap to reveal answer

Answer

The perimeter of a rectangle is the sum of four sides, two that are the base and two that are the height. To find the perimeter we add all four of them together.

Therefore the equation for the perimeter of a rectangle is

In this example we plug in the base and the perimeter so the equation looks like this

Perform the multiplication to get

Subtract from both sides to arrive at

Then divide by 2 to find the height $\frac{2(Height)}{2}=\frac{6}{2}$

The answer

← Didn't Know|Knew It →

0

Knew It