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Answer:
H²=l²+b²
b=√(h²-l²)
b=√(15²-12²)
b=√(225-144)
b=√81
b=9cm
Step-by-step explanation:
By Pythagoras theorem -
a*a + 12*12=15*15
a square + 144=225
a square = 225 - 144
a square = 81
a = underoot 81
a = 9