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A math problem in the ninth grade
After passing through B, make perpendicular lines with OP and OQ respectively, and pass OP through NOQ to M.

Get RT triangle

Shaping OBN

Orignal Brand Manufactuce

OBN in RT triangle

∠a=30

∴∠NBO=60

∵∠

POQ is a right angle.

∴∠ 1=90-30=60

In the RT triangle, OMB ∠2=90-60=30.

NOB and MOB in a triangle

∠a=∠2

OB=BO

∠ 1=NBO

∴ Triangle NOB≌ Triangle Mob (ASA)

∴NB=OC

No =BC

∠∠ABC is a right angle ∠2=30.

∴∠3+∠4=60

And < ∠NBM = 90°.

∴∠3+∠5=60

∴∠4=∠5

∠AMB=∠BMC=90。

Triangle

Triangle CMB

∴BN/BM=AB/BC means BN/NO=AB/BC.

√3/6=AB/BC

That's all. I hope it helps you.