**Basic Geometrical Ideas**

**Exercise 4.4**

Examples for Practice

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?

Point A is neither in the exterior nor in the interior, it is on the triangle ABC.

2).

a). Identify three triangles in the figure.

∆ABC, ∆ABD, ∆ADC.

b). Write the names of seven angles.

∟ABD, ∟ADB, ∟ADC, ∟ACB, ∟CAD, ∟BAD, ∟BAC

c). Write the names of six line segments.

AB, AC, AD, BD, CD, BC

d). Which two triangles have ∟B as common?

∆ABC and ∆ABD have ∟B as common.

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Chapter 4 Basic Geometrical Ideas

Chapter 3: Playing With Numbers

Chapter 2: Whole Numbers

Chapter 2: Knowing Our Numbers