Do it with Pythagoras property:
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Answer:
(29) ^2= (21)^2 + x^2
841= 441 + x^2
841-441=x^2
400 =x^2
x = sq rt of 400
x = 20
Answer:
(AB)²= ( BC) ²+( AC)²
29²=21² + x²
841 = 441 + x²
841 - 441 = x²
400 = x²
√400 = x
20 = x