Calculate b using surface area and base's edge

Ana.stasia

Junior Member
Joined
Sep 28, 2020
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118
The question is:
The side edge and the base create an angle of 60 degrees. Calculate b (the edge of the second base) using only P (the sum of all areas) and a (first bases's edge). I have drawn the shape in question.

This is how I did it. However it does not seem to be correct. Where am I wrong?

IMG_20201006_160241.jpgIMG_20201006_160246.jpgIMG_20201006_160251.jpgIMG_20201006_160256.jpg
 
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