Are there any more choices? it looks like B because the graph is decreasing.
The perimeter is the sum of all its sides.
That is for all triangles or polygons in general.
Good luck!
M.
Firstly, multiply both sides by 2: ![2A=h(b_1+b_2)](https://tex.z-dn.net/?f=%202A%3Dh%28b_1%2Bb_2%29%20)
Next, divide both sides by h: ![\frac{2A}{h}=b_1+b_2](https://tex.z-dn.net/?f=%20%5Cfrac%7B2A%7D%7Bh%7D%3Db_1%2Bb_2%20)
Next, subtract both sides by b1, and <u>your answer will be
</u>