Question

if angle C is 90 degrees then if r=inradius and R=circumradius then 2(r+R)=​

Answer 1

Answer:

2(45+43) because there is no sign

Answer 2

Tangents drawn from external points are of equal length.

⇒BD=BE=a−r [∵CD=r]

and AF=AE=b−r [∵CF=r]

∵AE+BE=AB

⇒b−r+a−r=2R [∵ AB is a diameter of circumcircle]

⇒b+a=2R+2r2(r+R)=a+b