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70 = 2.8 + 2.6 + 4s
70 = 16 + 12 + 4s
4s = 42
s = 10,5
(t limas)² = 10,5² - 5²
(t limas)² = 110,25 - 25
(t limas)² = 85,25
t limas = 9,2
V = 1/3.La.t
V = 1/3. 8. 6. 9,2
V = 147,2
= 2 ( 8 + 6 )
= 2 ( 14 )
= 28
kragka limas = 70
4xs + k = 70
4s + 28 = 70
4s = 70 - 28
4s = 42
s = 42/4
s = 10,5
s = adalah pajang krangka tegak pada limas
diagonal pada sisi alas
a = 1/2 x 10
= 5
tinggi limas
volume limas
volum = 1/3 x La x t
= 1/3 x 8 x 6 x 59,2
= 8 x 2 x 9,2
= 147,2 cm³