、af、hc

Area of triangular adc = area of triangular hdc = area of triangular hcg = area of semi-triangular hdg.

Similarly, the area of triangle abc = the area of triangle abf = the area of triangle aef = the area of half triangle bef.

In the same way; In a similar way

If a bd is connected.

You can get the area of the triangle abd= half a triangle aeh.

Triangle bcd= area of semi-triangular cfg.

Four formulas have been added.

Get the area of 2* quadrilateral abcd = one-half (efgh-abcd) area.

solve

The area of abcd is 13.2 square meters.