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=√9²+12²
=√81+144
=√225=15
Lp=L.alas+4×L.sisi tegak
=s²+4×1/2×a×t.sisi tegak
=18²+2×18×15
=324+540
=864 cm²
maaf klo salah
t segitiga / sisi tegak = √12^2 + 9^2 = √144 + 81 =√ 225 = 15 cm
L sisi tegak / segitiga = 4 ( 18 × 15 : 2 ) = 4 (135) = 540 cm
jadi, L limas = 324 cm + 540 cm = 864 cm
Semoga membantu :)