Take measurements and find the area of the filled triangle AF-6 mm. BD-25 mm. AD-20mm FB-18mm. FD-19mm.

To complete this task, you need to find the area of the filled triangles;

Consider the condition of the problem and analyze it; Both filled triangles are half of the corresponding rectangle. So, dividing the area of a rectangle by two, we get the area of triangles and then sum them up;

Find the area of the rectangle AFDE, AF = 6mm, FD = 19mm;

SAFDE = AF * FD = 6 * 19 = 114mm;

SAFD = 114/2 = 57mm;

Find the area of the rectangle FBDC, FB = 18mm, FD = 19mm;

SFBDC = FB * FD;

SFBDC = 18 * 19 = 342mm2;

SFBD = 342/2 = 171mm2;

S = SFBD + SAFD = 57 + 171 = 228mm2.