**Basic Geometrical Ideas**

## Exercise – 4.4

**Ex 4.4 Question 1.**

**1. Draw a rough sketch of a triangle ABC. Mark a point P in its interior and a point Q in its exterior. Is the point A in its exterior or in its interior?**

**Solution:**

Point A is neither interior nor exterior of the triangle. It is a vertex.

**Ex 4.4 Question 2.**

**2. (a) Identify three triangles in the figure.**

**(b) Write the names of seven angles.**

**(c) Write the names of six line segments**

**(d) Which two triangles have ∠B as common?**

**Solution:**

(a) The three triangles = ∠ABD, ∠ACB, ∠ADC

(b) The angles = ∠BAC, ∠BAD, ∠CAD, ∠ADB, ∠ADC, ∠ABC, ∠ACB

(c) The line segments =

,

,

,

,

,

(d) ∠ABD and ∠ABC are triangles that have ∠B as common.