Question

the area of a rhombus is 98 CM square if one of its diagonal is 14 cm what is the length of the Other diagonal

Answer 1

area of rhombus =diagonal1 ×diagonal2

98=14×diagonal2
diagonal2=7

Answer 2

the area of rhombus is 
1/2{product of its diagonal}

it is given that area of rhombus=98 cm sq.
             one of the diagonal is =14 cm
let known diagonal be x=14 and unknown be y

we need to find here y
so    1/2{x × y}=98
        1/2{14×y}=98
       14y=98×2
         14y=196
y=14
so the length of other diagonal is 14cm