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b=6cm
(10cm-6cm):2=4cm:2= 2cm
h²=5²-2²
h²=25-4
h²=21
h=√21 (cm)
Pt= ½ × (a+b) × h
Pt= ½ × (10cm+6cm) x √21
Pt= ½ × 16cm × √21
Pt= 8 √21 cm²