# Computation of Area

Rural Technology

Computation of Area

One of the objectives of land surveying is to determine the area of the land surveyed.

• • To measure area of the plot, first draw the map using plane table methods.
• • Divide the entire figure into a number of triangles.
• • Area of each triangle is calculated using mathematical formula.
• • Areas of all such triangles are added to get the area of the field measured.
• • The base and altitude of each triangle are scaled and its area is found by multiplying half the base by the altitude.

• 1) It is most suitable for preparing small scale maps.
• 2) It is most rapid.
• 3) No great skill is required to prepare a satisfactory map.

• 1) It is heavy to carry.
• 2) It is not intended for accurate work.
• InText Questions 1.2
• 1) What is the formula for finding the area of triangle?
• 2) Find out the area of triangle of side 3cm,3.2cm,6cm?( fig of the triangle)
• State True /False:
• 3) Height of triangle is called altitude of triangle (…................)
• 4) Plane table is intended for the accurate work (....................)

WHAT YOU HAVE LEARNT

In this lesson, you have learnt, map and its uses . Conducting survey and drawing the maps using the plane table survey. We also learnt how to compute area of the field using the plane table.

Rural Technology