Answer:
Ab^2 = CA^2 + BC^2
8^2 = 6^2 + a^2
64 = 36 + a^2
64-36 = a^2
28 = a^2
square root of 28 = square root of a^2
5 ,29 = a
5 = a
for (8,4) is 2 and for (20,_4) is _5
A. 45
B. 43
D. 90
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7 , 5 , 9
Step-by-step explanation: