Explanation:
h²=o²+a²
a²=8²+5²
a²=64+25
a²=89
a=√89
a=9.433
To one decimal place it is 9.4
for b,
17²=b²+12²
289=b²+144
289-144=b²
145=b²
b=√145
b=12.041
To one decimal place it is 12.0
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