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135 = 1/2 x 15 x a
135 x 2 x 15 = a
18 = a (alas)
luas permukaan
= (luas alas) + (4xluas segitiga)
= (18 x 18) + (4 x 1/2 x 15 x 18)
= (324) + (540)
= 864 cm kuadrat
alhamdulillah sudah di koreksi guru saya, semoga jawabannya benar
tinggi Limas= 15 cm
dicari : Luas permukaan Limas...
dijawab : L.p Limas= Luas alas + 4×Luas segitiga
-L.segitiga : 1/2 alas × tinggi
135 cm : 1/2 alas × 15
135×2÷15 = alas
18 cm = alas
-L.p Limas = 18 + 4×135
= 18 + 540
= 558 cm