Ответ:
h²= 13²-5²= 169-25 = 144
h= 12cm
S=1/2 •h•a
S=1/2•12•13= 78cm²
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Ответ:
h²= 13²-5²= 169-25 = 144
h= 12cm
S=1/2 •h•a
S=1/2•12•13= 78cm²