NO 26 Luas daerah yang di arsir adalah

L1 = 5×12/2 = 30cm²
L2 = 5×8/2 = 20cm²
L3 = 5×4/2 = 10cm²
luas daerah yg diarisir = L1+L2-2×L3
= 30+20-2×10
= 50-20
= 30cm²(B)

L.sgitiga 1 = 1/2 × a × t
= 1/2 × 5 × (4+4+4)
= 1/2 × 5 × 12
= 5 × 6
= 30 cm²

L.sgitiga 2 = 1/2 × a × t
= 1/2 × 5 × (4+4)
= 1/2 × 5 × 8
= 5 × 4
= 20 cm²

L.sgitiga 3 = 1/2 × a × t
= 1/2 × 5 × 4
= 5 × 2
= 10 cm²

L.arsir= (L.sgitga 1+ L.sgitga 2) - 2 × L.sgitga 3
= (30 + 20) - 2 × 10
= 50 - 20
= 30 cm²

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