Idk Thai is for me to get points
The equation is 
Step-by-step explanation:
Let us revise how to make a variable subject of an equation
- Write the equation and circle the variable you want to make it subject
- Keep it in one side and move all other in the other side
- Make the coefficient of the subject 1
∵ A =
× b × h
∵ b is the subject
∴ Multiply the two sides by 2
∴ 2A = b × h
- Divide both sides by h
∴ 
- Switch the two sides
∴ 
The equation is 
Learn more:
You can learn more about the equations in brainly.com/question/10708697
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The formula for perimeter is 2L +2W
Replace w with 20 and L with 11:
2(11) + 2(20) = 22 + 40 = 62
This does not equal 64, so the perimeter cannot be 64 with 20 and 11 being the dimensions.