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friends today we are doing a construction of 45 degree and will justify it this is important for class 910 as chapter name is conception and plus six to eight the chapter name is practical geometry here you go I'm just giving you the rough idea you draw an arc name it Opie take a suitable radius from oh boy then whatever is away you just put compass a cut an arc that is equal to a B and which is equal to OB also so your angle a o B is 60 degree okay but the same radius you can cut in the same arc on the same arc like this it means your a B is equal to BC so your angle a or C will be 120 degree when you join OB then angle AOB 60 when you join OC your angle AOC is 120 when you bisect them your answer will be 90 degree here you put a compass on B you cut an arc like BC has radius or you can take more than BC with the same radius now you put a compass on C you get a knock here when you join them among this point as D your angle a or D is 90 degree got it let me put a point here e so your angle a Oh e is also 90 degree you put a compass on a but the radius a e or more than a you cut your knife like this with the same radius but from es Center you cut a knock here and you join them this point is F the mangle a Oh F will be fortified agree now friends now a justification part ok justification is this as simple you know that angle a o B is 90 degree okay and by consumption we have just oh F is the angle bisector of angle a or b so and the a Oh F is equal to angle B Oh F which is equal to half of angle a or D which is equal to half of angle 90 degree that means 45 degree I got this as a conclusion that Oh F is the angle bisector of a or b or a o e which is the same thing a OD or a OE because we mobbed a OD as a we I hope you understood this question god bless you all