Skip to content
Philoid
Browse Saved
Back to chapter
Maths
20. Mensuration-I (Area of a Trapezium and a Polygon)
Home · Class 8 · Maths · Ref. Book · 20. Mensuration-I (Area of a Trapezium and a Polygon)
Prev
Next
Q19 of 47 Page 20

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


More from this chapter

All 47 →
17

The cost of fencing a square field at 60 paise per metre is Rs. 1200. Find the cost of reaping the field at the rate of 50 paise per 100 sq. metres.

18

In exchange of a square plot one of whose sides is 84 m, a man wants to buy a rectangular plot 144 m long and of the same area as of the square plot. Find the width of the rectangular plot.

20

A garden is in the form of a rhombus whose side is 30 metres and the corresponding altitudes is 16 m. Find the cost of levelling the garden at the rate of Rs. 2 per m2.

21

A field in the form of a rhombus has each side of length 64 m and altitude 16 m. What is the side of a square field which has the same area as that of a rhombus?

Questions · 47
20. Mensuration-I (Area of a Trapezium and a Polygon)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5
Back to chapter
ADVERTISEMENT
About Contact Privacy Terms
Philoid · 2026
  • Home
  • Search
  • Browse
  • Quiz
  • Saved