# CBSE Class 10-Mathematics: Chapter – 7 Coordinate Geometry Part 20 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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