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when you take two trapezoids put them together it makes a parallelogram if u cut it in half you get b1 and b2

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A parallelogram is made up of 2 trapezoids and if you divide the parallelogram in half you’ll get b1 and b2

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A parallelogram is made up of two trapezoids, you can get the b1+b2 by dividing the area of the parallelogram!

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Two trapezoids make a parallelogram and if you divide you get the 1/2 that is in the (b1+b2)

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Two trapezoids makes a parallelogram. so you take the area of the trapezoid and divide it by two. (b1+ b2) becomes 1/2(b1+b2) because its half.

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When you take a trapezoid, put it next to the other, it makes a parallelogram. You take the area of the parallelogram  and divide it by 2.

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You add the 2 bases and divide that by 2. Then multiply that by the height.

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they realized that if you duplicate the trapezoid then you will have a parallelogram 

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they realized that if you duplicate the trapezoid then you will have a parallelogram 

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if you have 2 trapzoids flipped over you get base 1 and base 2 added together but the height is the same

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two trapezoids make a parallelogram

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Add the bases of the trapezoid to get something similar to a parallelogram. You multiply be height to get the area. Because you now have 2 trapezoids making a parallelogram, you divide area by 2 to get the area of just one trapezoid.

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take your first trapezoid with known variables flip it 180 degrees then translate to the orginal.(b1+b2) then divide by 2 to get one trapezoid.

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make  a parallelogram with two congruent trapezoids and then do one half of the area of that parallelogram to figure out the formula
the formula (b1+b2)*h all over 2

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2 trapezoids are 1 parallelogram, the area of the parallelogram is b1+b2 so the trapezoid is 1/2(b1+b2).

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The formula of a trapezoid is from two trapezoids put together to form a parallelogram so the formula of a trapezoid is the formula of a parallelogram times 1/2.

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Since a parallelogram is made out of two trapezoids you need to divide the parallelogram by 2.(b1+b2)h change into 1/2h(b1+b2)

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You copy two trapezoids then rotate one and put it together/attach then that creates a parallelogram which is (b1+b2)*h  then you divide that by 2 for one trapizoid

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Because two trapezoids are equal to one parallelogram. The area of a parallelogram is b1+b2 so, it turns out to be 1/2(b1+b2) because it is half.

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two trapezoids equal a parallelogram, so you use the formula of a parallelogram then divide by two to get half which would equal the trapezoids area

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Copy the trapezoid, rotate one 180 degrees, and attach the 2 together to make a parallelogram. Take the formula for the parallelogram and divide it by 2

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Two trapezoids = 1 parallelogram and the area of a parallelogram is b1+b2 so it is 1/2(b1=b2)

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Two trapezoids make a parallelogram

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you make two of the in to a paralagram then you divided it by 2

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two trapezoids create a parallelogram, the area of a paralellogram is b1 + b2 therefor it is 1/2 (b1=b2)

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Two congruent trapezoids are put together to form a parallelogram. Since the area of a parallelogram is (b1 + b2)* h you have to take half of that to find the area of a trapezoid. So to find the area of a trapezoid this is the formula 1/2h(b1 +b2)

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Someone found out that 2 trapezoids together make a parallelogram so you can divide it by 2 two find the original area.

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Someone figured out that 2 of the same trapezoids together make a parallelogram

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two equal trapezoids put together equal a parallelogram

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Someone who wanted to make math harder for everybody figured out that two trapezoids make a parallelogram.

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two trapezoids make a parallelogram

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2 of the same trapezoid make a parallelogram so you find the area of that parallelogram then half it to find the area of the trapezoid

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Two trapezoids make a parallelogram so you find the area of the parallelogram and divide it by two to find the original area of the trapezoid.

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Some math person figured out that two trapezoids make a parallelogram. then PCPT