First slide

Definition of a circle

Question

$T h e n u m b e r o f c i r c l e s t o u c h i n g a l l t h e t h r e e l i n e s$ $2 x - y = 5, x + y = 3, 4 x - 2 y = 7 i s$

Very Easy

A

1
B

2
C

3
D

4

Solution

$O u t o f 3 l i n e s 2 a r e p a r a l l e l$
$\Rightarrow Two circles touches 3 lines$

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