Question

Find the Area of the Quadrilateral ABCD, in which AB=7cm, BC=6cm, CD=12cm, DA=15 and AC=9cm​

Answer 1

Answer:

By using the Heron's formula√s (s-a) (s-b) (s-c) for the triangle ABC .. Draw a quadrilateral ABCD and name them &draw the diagonal AC √11 (11-7) (11-9) (11-6)

√11(4) (2) (5)

2√2×5×11

2√110

The answer of first triangle ABC area is 20.9761

For the second triangle ACD

√18 (18-15) (18-12) (18-9)

√18 (03) (06) (09)

√(3×3×3×2) whole square

Here, square root square becomes cancels

Then,the triangle ACD area is 54

By,adding two triangles areas 20.9761 +54 =74.9761