Keliling dan luas bangun datar yang dituliskan di bawah ini adalah persegi, persegi panjang, segitiga, jajarangenjang, trapesium, layang-layang, belah ketupat, lingkaran.
Persegi
Panjang AB = BC = CD = DA
Keliling = 4 x sisi
= 4 x AB
Luas = sisi x sisi
= AB x BC
Persegi Panjang
Panjang EF = GH bisa juga disebut panjang p
Panjang EH = FG bisa juga disebut lebar l
Keliling = 2 x ( panjang + lebar )
= 2 x ( p + l )
= 2 x ( EF + FG )
Segitiga
Keliling = IJ + JK + KI
Luas = (1/2) x alas x tinggi
= (1/2) x IJ x t
= (1/2) x a x t
Jajarangenjang
Panjang LM = NO dan panjang LO = MN
Keliling = 2 x ( LM + MN )
Luas = alas x tinggi
= a x t
= LM x t
Trapesium
Keliling = PQ + QR + RS + SP
Luas = ( 1/2 ) x jumlah sisi sejajar x tinggi
= ( 1/2 ) x ( a + b ) x t
= ( 1/2 ) x ( PQ + RS ) x t
Layang-layang
Panjang TU = TW dan UV = VW
Keliling = 2 x ( TU + UV )
Luas = ( 1/2 ) x TV x UW
Belah Ketupat
Panjang AB = BC = CD = DA
Keliling = 4 x sisi
= 4 x AB
Luas = ( 1/2 ) x AC x DB
Lingkaran
d = diameter
r = jari-jari
besar diameter sama dengan dua kali jari-jari d = 2r
Keliling = $\pi d$
Keliling bisa juga dihitung dengan menggunakan rumus
Keliliung = $2\pi r$
Luas = $\pi {{r}^{2}}$
$\pi =\frac{22}{7}\text{ atau }\pi =3,14$
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