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BD = 12
BC = 20
CD tegak lurus AB (CD = tinggi segita ABC)
1. Mencari panjang AB
AB = AD + DB
= 30 + 12
= 42
2. Mencari panjang CD
Segitiga CDB siku-siku di D.
CD =
= 16
3. Mencari panjang AC
Segitiga CDA siku-siku di D
AC =
=
= 34
a. Keliling
Keliling = AB + BC + CA
= 42 + 20 + 34
= 96
b. Luas
1/2 * alas * tinggi
= 1/2 * AB * CD
= 1/2 * 42 * 16
= 336