āϝāĻĻāĻŋ ABCD āϏāĻžāĻŽāĻžāĻ¨ā§āϤāϰāĻŋāĻ•āϟāĻŋāϰ ∠BAD=60° āĻ“ ∠AOB=90° āĻšā§Ÿ, āϤāĻŦ⧇ āϏāĻžāĻŽāĻžāĻ¨ā§āϤāϰāĻŋāĻ•āϟāĻŋāϕ⧇ āϕ⧀ āĻŦāϞāĻž āϝāĻžāĻŦ⧇? | Prostuti