The triangle and the trapezoid have the same area. Base b2 is twice the length of base b1. What are the lengths of the bases of the trapezoid?

What do you do after you find the area of the triangle?

Triangle: base=21 cm, height=6cm
Trapezoid: height=6 cm, b1=?, b2=?

8 answers

the area of the triangle is ... half the base, times the height

the area of the trapezoid is ... the average of the bases, times the height

[(b1 + b2) / 2] * 6 = 1/2 * 21 * 6 ... b1 + b2 = 21

b2 = 2 * b1

11 and 5

I don' get what b1 is! Help

I dont it either!!!

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i have this for my kids homework and we don't get it

5=b1 11=b2

Thank you but I am still a little bit confused could you please help me out a bit?