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l = 3,75
p = kell : 2 - l
= 20,3 : 2 - 3,75
= 10,15 - 3,75
= 6,4
luas = p x l
= 6,4 x 3,75
= 24
20,3 = 2p + 2(3,75)
20,3 = 2p + 7,5 cm
2p = 20,3 - 7,5
2p =12,8
p = 12,8 / 2
p = 6,4 cm
Luas = p x l
Luas = 6,4 x 3,75
Luas = 24 cm²