Matematika, tolong bantu jawab.

Diket = r = 7 cm
             s = 20 cm
dit = lsk
Jawab = lsk = π x r ( r + s )
                         [tex] \frac{22}{7} [/tex] x 7 cm ( 7 cm + 20 cm )
                         22 cm x 27 cm
                         594 cm²