Answer:
I haven't learn this yet but you can maybe ask desmos that app is helpful maybe it can help with your question.
Answer : The equation for 'h' is 
Step-by-step explanation :
The given equation is:

Now we have to determine the equation for 'h'.

Multiplying the equation by 2.

on simplifying, we get:

Dividing the equation by 'b'.


or,

Therefore, the equation for 'h' is 
It is generally useful to use the formula. The procedure is to substitute the given values for the variables in the formula, then do the arithmetic.
... A = (1/2)r²·θ . . . . r is the radius, θ is the central angle in radians
Put the numbers in ...
... A = (1/2)(4 in)²·(π/3)
... A = 8π/3 in² ≈ 8.37758 in²
I think the second to last one.