Height of the arc - formula

Calculate the height of the arc if the length of the arc is 77 and chord length 40.
Does exist a formula to solve this?

Correct result:

h =  26.55


α0= 1.57079632679 = 90°; r = 49.0197224723; h = 14.358
α1= 2.72236110757 = 155°58'47″; r = 28.2842712475; h = 22.399
α498= 3.70059415974 = 212°1'42″; r = 20.8074694701; h = 26.548
α499= 3.70059415974 = 212°1'42″; r = 20.8074694701; h = 26.548

40=2rsin(α/2) 77=αr 40=2(77/α)sin(α/2) α=2(77/40)sin(α/2) αn+1=2(77/40)sin(αn/2) αn+1=3.85sin(αn/2) α=3.70059415974212142" r=77/α=20.8074694701  h=r(1cosα/2)=26.55

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