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1/2*8*h=17
4h=17 /:4
h=4,25
2P = a*h |:a
h = 2P/a
h = (2*17cm²)/8cm
h = 34cm²/8cm
h = 4,25cm
17cm²= (8cm *h)/2 //*2
34cm²= 8h cm //:8
h= 4,25cm