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115=23 * h / 2
115=11,5 *h
h=10
115 cm2 = 1/2 *(10cm+13cm)*h
115cm2= 11,5cm *h
h= 115 cm2 : 11,5 cm
h=10 cm
115=½ ((10+13)x h) = ½ (23x h) /x2
230= 23 x h /:23
h= 10