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L = p·l
= 15·7
= 105 cm²
K = 2·p + 2·l
= 2·15 + 2·7
= 30 + 14
= 44 cm
2. Persegi
L = S²
= 10²
= 100 cm²
K = 4·S
= 4·10
= 40 cm
3. Trapesium
L =
=
= 23·4
= 92 cm²
K = a + b + 2·sisi miring
= 15 + 8 + 2·10
= 23 + 20
= 43 cm
4. Jajar Genjang
L = a·t
= 15·10
= 150 cm²
K = 2·sisi miring + 2·a
= 2·12 + 2·15
= 24 + 30
= 54 cm
5. Layang-layang
L =
=
=
= 225 cm²
K = 10 + 20 + 20 + 10
= 60 cm