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Answer 19. 30cm²
Step-by-step explanation:
h= 13cm
a= 12 cm
h²= a²+b²
13² = 12² +b²
169 = 144 + b²
b² = 25
b= 5
Area of triangle = 1/2 ab
=1/2*12*5
= 6*5
= 30 cm²
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