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360 = 10 x 10 + 4 x st
360 = 100 + 4 x st
360 - 100 = 4 x st
260 = 4 x st
65 = st
st = a x t : 2
65 = 10 x t : 2
t = 13 -- ini tinggi sisi tegak
tinggi limas = √tinggi st² - stngh rusuk²
= √13² - 52
=√169 - 25
=√144
= 12cm --- tinggi limas
bila bermanfaat jadikan yang terbaik yaa