# CBSE Class 10-Mathematics: Chapter –7 Coordinate Geometry Part 20

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**Question 8:**

Find the area of the quadrilateral whose vertices taken in order are and .

**Answer:**

Area of quadrilateral . units.

**Question 9:**

The vertices of are and . A line is drawn to intersect sides AB and AC at D and E respectively such that .

Calculate the area of the and compare it with the area of

**Answer:**

Now coordinate of D and E are

**Question 10:**

Prove that the points are the vertices of an equilateral triangle. Calculate the area of this triangle.

**Answer:**

Let