Jawabanmu

2014-05-31T09:58:46+07:00
Cos TBC = 1/√5
menentukan TB = TC = a.
1/
√5 = a² + b² - a² / 2.ab
1/√5 = 5 / a
a = 5√5
Cari tinggi limas:
t² = TC² - (10√3/3)²
t² = 125 - 100/3
t² = 275/3 = 825/9
t = 5/3 √33