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11200 = 1/3.s².21
11200 = 7.s²
s² = 11200/7
s² = 1600
s = √1600
s = 40 cm
1/2.40 = 20 cm
maka :
t.sisi tegak limas
= akar dr 20²+21²
= akar dr 400+441
= √841
= 29 cm
jadi,
Lp limas = L alas + jumlah L sisi tegak
= s² + 4.1/2.a.t
= 40² + 4.1/2.40.29
= 1600 + 2320
= 3920 cm²
La=11200:7=1600
Panjang sisi alas=√1600=40
Luas perm