Question

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Answer 1

Aabc=AC•BC•sin C totul supra 2
$\frac{15 \times 12 \times sin30}{2} = \frac{15 \times 12 \times \frac{1}{2} }{2} = \frac{90}{2} = 45 {}$

Answer 2

A=AB×BC×sin30°/2

A=(15×12×1/2)/2

A=15×6/2

A=90/2

A=45