S= (a+b+c) ÷2
= (8cm +5cm+7cm) ÷2
= 10cm
A= √s(s-a)(s-b)(s-c)
= 10cm (10cm-8cm)(10cm-5cm)(10cm-7cm)
=17.3cm²
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S= (a+b+c) ÷2
= (8cm +5cm+7cm) ÷2
= 10cm
A= √s(s-a)(s-b)(s-c)
= 10cm (10cm-8cm)(10cm-5cm)(10cm-7cm)
=17.3cm²