Dr Pooranmal and Ashfaq A Khan Solutions for Chapter: Circles, Exercise 1: EXERCISE 19.1

Mark a point $O$ on your notebook. Draw a circle of radii $2 \mathrm{cm}, 3 \mathrm{cm}, 5 \mathrm{cm}$ with the same centre $O$.

Draw a circle with centre $O$ and any radius. Draw $AC$ and $BD$ perpendicular to each such that $AC$ and $BD$ are diameters of the circle. Join $AB, BC, CD$ and $DA$.

Mark two points $A$ and $B$ on your note book. Draw a circle with centre $A$ and $B$ lying on the circumference of the circle.

Draw a semicircle with centre $O$ and radius $6.5 \mathrm{cm}$. Is the diameter that determines the semi-circle a part of the semi-circle?

All radii of a circle are _____.

A diameter is the longest _____.

A chord of a circle contains exactly _____ points of the circle.

Concentric circles are circles having _____ centres (same/ different)