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= 15 cm
Lselimut = 1/2 × 18 × 15 × 4
= 18 × 15 × 2 = 540 cm²
Maaf kalau ada kesalahan
nyari tinggi segitiga
18 : 2 = 9
(9 X 9) + (12X 12)
81 + 144
= 225 di akar
=15 cm
luassegitiga atau sisi tegak
a X t :2
18 X 15 : 2
=135 cm...
selesai