Answer:
Area = 630/11 cm² = 57 3/11 cm²
Explanation:
Area = (5 cm)(KN) = (6 cm)(KL)
Perimeter = 2(KN +KL) = 42 cm
So, ...
KN = 1.2·KL . . . . divide the area equation by 5 cm
1.2·KL +KL = 21 cm . . . . . divide the perimeter equation by 2
KL = (21 cm)/2.2 . . . . . . . divide by the coefficient of KL
Substituting for KL in the area equation, we have ...
Area = (6 cm)(21 cm)/2.2 = 630/11 cm²