= (2(p + l) ÷ 2) ÷ 4
= (2(40 + 20) ÷ 2 ÷ 4
= (2(60) ÷ 2) ÷ 4
= 60 cm ÷ 4
= 15 cm
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= (2(p + l) ÷ 2) ÷ 4
= (2(40 + 20) ÷ 2 ÷ 4
= (2(60) ÷ 2) ÷ 4
= 60 cm ÷ 4
= 15 cm