Question

Q .18 and Q.20 second choice ABC is right angled triangle at b this one

Answer 1

In ∆ ADC, we get

<1 = 180-90-<A

=90-<A ....(1). ( angles sum property of a ∆)

In ∆ ABC , we get

<2 = 180-90-<1

= 90-<1 ......(2). (::::::::::::::::)


From (1) and (2) , we get.
<1 =<2

Answer 2

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