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20. base = 12 cm
perimeter = 32cm
equal sides = (32-12)/2
= 20/2
= 10cm
semi perimeter = (12+10+10)/2
=16
area= √(16-12)×(16-10)×(16-10)
=√4×6×6
=12 cm^2
perimeter = 32cm
equal sides = (32-12)/2
= 20/2
= 10cm
semi perimeter = (12+10+10)/2
=16
area= √(16-12)×(16-10)×(16-10)
=√4×6×6
=12 cm^2
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