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2. alas = 6 + 4 = 10
jadi 3 x 10 dibagi 2 = 15
semoga bermanfaat
40 = 15+15+BC
40 = 30+BC
40-30 = BC
10 = BC (No. 36)
LΔ = x alas x tinggi
= x 10 x 3
= 15