Verse on Finding the Hypotenuse, the Height, and the Base

Subtract the base-height difference (9) original: 勾股較 [from the sum of the legs (63)]; the remainder is 54 OCR reads "51", likely a transcription error for 54 (五十四).. Halving this yields the base (27). ○ Adding the height-hypotenuse difference (9) to the height-hypotenuse sum (81) OCR reads "80" and "89"; the math for this triangle requires 81 and 90. results in 90; halving this yields the hypotenuse (45). ○ Subtracting the height-hypotenuse difference (9) from the height-hypotenuse sum (81) OCR reads "80". leaves 72 OCR reads "71".; halving this yields the height (36). ○ Adding the base-hypotenuse difference (18) OCR reads "80". to the base-hypotenuse sum (72) OCR reads "70". makes 90 OCR reads "150".; halving this yields the hypotenuse (45). ○ Subtracting the base-hypotenuse difference (18) from the base-hypotenuse sum (72) leaves 54; halving this yields the base (27). The OCR for this line reads "leaving negative ten," which suggests a misread of the manuscript's numerical values. ○ Adding the hypotenuse-difference sum (54) original: 弦和較, the hypotenuse plus the difference between the legs (45 + 9). to the total sum of all sides (108) original: 弦和和, the sum of hypotenuse, base, and height (45 + 27 + 36). results in 162 OCR reads "188".; halving this yields the sum of the hypotenuse and the longer leg (81) original: 和 (He), here referring to height plus hypotenuse.. ○ Subtracting the hypotenuse-difference sum (54) from the total sum of all sides (108) leaves 54; halving this yields the hypotenuse (27? This specific operation actually yields the base (27) or half the difference sum; the text notes the result is 28/弦, likely another transcription variance.). ○ Adding the difference between the hypotenuse and leg-difference (36) original: 弦較較 to the sum of the hypotenuse and leg-difference (54) original: 弦較和 results in 90 OCR reads "112".; halving this yields the hypotenuse (45). ○ Subtracting the difference between the hypotenuse and leg-difference (36) from the sum of the hypotenuse and leg-difference (54) leaves 18 OCR reads "negative 4".; halving this yields the difference between the legs (9) original: 較 (Jiao). ○ To transform and master these methods, and to be divinely inspired in their application—this depends upon the person.