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Pre-Algebra 21 Online
OpenStudy (anonymous):

Please help. I really need help. This is soo confusing. Will fan and medal.

OpenStudy (anonymous):

What is your question?

OpenStudy (anonymous):

Use the formula for the area of the trapezoid.

OpenStudy (anonymous):

Okay?

OpenStudy (anonymous):

A=h\[\frac{ b1+b2 }{ 2 }\]

OpenStudy (anonymous):

What is the measurements for your trapezoid?

OpenStudy (anonymous):

a = base, b = base, and h = height

OpenStudy (anonymous):

I'll be right back. Tag me when you get the measurements!

OpenStudy (anonymous):

Length of the bases, and h is the height, to answer the question. How many square feet of grass are there on a trapezoid field with a height of 175ft and the bases of 125ft and 81ft

OpenStudy (anonymous):

@HistoryGeek18 ^^

OpenStudy (anonymous):

where A is area b1 and b2 ar the ^^length of the bases. (it's before that post.

OpenStudy (anonymous):

Alrighty your overall area equals A = 18,025.

OpenStudy (anonymous):

Do you have an idea of how I got that?

OpenStudy (anonymous):

Not entirely. That's why I'm confused.

OpenStudy (anonymous):

IS there anyway you can describe it?

OpenStudy (anonymous):

okay so, a is your "top base" or the top measure of your trapezoid so the smallest measurement for the bases is what you'll plug in for a base.

OpenStudy (anonymous):

as in a^1 = 81

OpenStudy (anonymous):

b^2 = 125

OpenStudy (anonymous):

because "b" is always the bottom of your trapezoid.

OpenStudy (anonymous):

Okay.

OpenStudy (anonymous):

So plug those into the equation for me.

OpenStudy (anonymous):

\[\frac{ 81 }{ 125 }\] is this correct?

OpenStudy (anonymous):

No.

OpenStudy (anonymous):

a + b

OpenStudy (anonymous):

plug in base "a" and base "b"

OpenStudy (anonymous):

Then I'm confused.

OpenStudy (anonymous):

so 81+125?

OpenStudy (anonymous):

The equation for a trapezoid is a + b divided by 2 = h

OpenStudy (anonymous):

Yes! so now our equation looks like this: 81 + 125 _________ = h 2

OpenStudy (anonymous):

What do we plug in for h?

OpenStudy (anonymous):

so H=103?

OpenStudy (anonymous):

Where did you get 103?

OpenStudy (anonymous):

Wait. I'm doing something wrong.

OpenStudy (anonymous):

You're not adding quite yet!

OpenStudy (anonymous):

oh okay.

OpenStudy (anonymous):

Your equation right now if you plugged in h = 175

OpenStudy (anonymous):

should look like this: 8 + 125 ________ = 175 2

OpenStudy (anonymous):

wait. 8 or 81?

OpenStudy (anonymous):

Sorry 81

OpenStudy (anonymous):

81 = a

OpenStudy (anonymous):

\[\frac{ 81+ 125}{ 2} =h\]

OpenStudy (anonymous):

Yes! Now, plug in for h = height

OpenStudy (anonymous):

no sorry 175?

OpenStudy (anonymous):

h = 175

OpenStudy (anonymous):

okay. oh wait. I just rechecked the equation. its 75 not 175. Does the equation still stay the same?

OpenStudy (anonymous):

Yes, so now we just want to plug in 75 for h instead of 175

OpenStudy (anonymous):

\[\frac{ 81+125 }{ 2}=75\]

OpenStudy (anonymous):

Yes!!!! Now, solve the fraction part of your equation first!

OpenStudy (anonymous):

66.5 * 75 = ?

OpenStudy (anonymous):

I already divided for you just solve that for me.

OpenStudy (anonymous):

oh okay. 4987.5?

OpenStudy (anonymous):

Oops I'm sorry

OpenStudy (anonymous):

Solve 103 * 75 = ?

OpenStudy (anonymous):

7725?

OpenStudy (anonymous):

Correct!

OpenStudy (anonymous):

So, A (area) = 7,725

OpenStudy (anonymous):

Okay. So is that it?

OpenStudy (anonymous):

Yes, let me show you the whole equation so you can use it next time.

OpenStudy (anonymous):

Okay thanks!

OpenStudy (anonymous):

A = a + b/2 * h = 81 + 125/2 * 75 = 7725

OpenStudy (anonymous):

There you are! Hope I helped you!

OpenStudy (anonymous):

You really helped thanks!

OpenStudy (anonymous):

Great! Tag me if you need anything else!

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