# 11.8.4. Heron's Formula

Determine the area of the quadrilateral to the nearest 3 decimal places.

- A
- B
- C
- D

### Example

Determine the area of the quadrilateral to the nearest 3 decimal places.

### Solution

The quadrilateral is composed of two triangles. The first triangle,

According to Heron's formula, the area of a triangle whose side lengths are

The second triangle of which the quadrilateral is composed,

Thus, the area of the quadrilateral is approximately