## Part One

## Lesson 1 – Geometrical Figures

**Q) Collect some pictures in which you can see angles. Mark those angles using a pencil.**

**Ans: ***The angles are marked in pink.*

**Q) Look at the angles that can be made at your elbow.**

**Ans: **

**Observe the figures below and write “right angle”, “acute angle” or “obtuse angle” in the box below each figure.**

**Ans:**

**Make right angles by joining the dots in the box below.**

**Ans:**

**Make acute angles by joining the dots.**

**Ans:**

**Make obtuse angles by joining the dots.**

**Ans:**

**Make a right angle, acute angle and obtuse angle at your elbow. Show these angles to your friends and check theirs.**

**Ans:** *Students must do this on their own.*

**Check! Is this true?**

**The angle an electric pole makes with the ground is a right angle. **

**Ans:** True

**The slide makes one acute angle and one obtuse angle with the ground.**

**Ans:** True

**The ladder makes one acute angle and one obtuse angle with the wall. **

**Ans:** True

**The angle between the thorns of the babul tree is an obtuse angle.**

**Ans:** True

**Leaving the thumb, the angles between any two adjoining fingers is an acute angle.**

**Ans:** True

**Look at each circle. Is the line shown by the arrow a chord, a diameter or a radius of the circle? Write it in the box below.**

**Ans:**

**Observe the figures and complete the table below.**

**Ans:**

**Look at the figures and complete the table below.**

**Ans:**