Roboguru

begin mathsize 14px style straight t equals square root of open parentheses BO close parentheses squared minus open parentheses begin inline style 1 half end style AB close parentheses squared end root straight t equals square root of 17 squared minus open parentheses begin inline style 1 half end style 16 close parentheses squared end root straight t equals square root of 17 squared minus 8 squared end root straight t equals square root of... space minus space... end root straight t equals square root of... end root straight t equals.... end style

begin mathsize 14px style straight L equals begin inline style 1 half end style cross times straight n cross times straight a cross times straight t straight L equals begin inline style 1 half end style cross times 7 cross times 16 cross times space... straight L equals... space cm squared end style 

Jawaban:

begin mathsize 14px style straight t equals square root of open parentheses BO close parentheses squared minus open parentheses begin inline style 1 half end style AB close parentheses squared end root straight t equals square root of 17 squared minus open parentheses begin inline style 1 half end style 16 close parentheses squared end root straight t equals square root of 17 squared minus 8 squared end root straight t equals square root of 289 minus 64 end root straight t equals square root of 225 straight t equals 15 space cm end style

begin mathsize 14px style straight L equals begin inline style 1 half end style cross times straight n cross times straight a cross times straight t straight L equals begin inline style 1 half end style cross times 7 cross times 16 cross times 15 straight L equals 840 space cm squared end style   

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