The area of a rhombus is 84 m2. If its perimeter is 40 m, then find its altitude.
Perimeter of rhombus = 4 × side
Side of rhombus = 
Rhombus is a type of parallelogram, Hence area oa rhombus = area of parallelogram
Therefore area of parallelogram = base× altitude
Base× altitude = area of parallelogram
10 × altitude = 84
Altitude of rhombus = 8.4 m
19