ENEO LA MRABA-2

Tafuta eneo la umbo lifuatalo ikiwa mzingo wake ni m 20.

Suluhu

Pande zote ni sawa. Huu ni mraba.

Mzingo = Upande x 4

20= (2y-7) x 4

20 = 8y-28

20 + 28 = 8y

48 = 8y

48 = 8y

 8      8

6 = y

Sasa tunatafuta urefu wa upande mmoja

Upande = 2y – 7

               = (2x6) – 7

               = 12 – 7

               = 5

Kwa kuwa tunao upande, sasa twatafuta eneo.

Eneo = upande x upande

          = 5 x 5

          = 25

Hivyo eneo la mraba ni m²25