Question

Observe the below image and answer it:

Answer 1

$\hugeᎪΝՏᏔᎬᎡ : -$

• ᴀs ᴡᴇ ᴋɴᴏᴡ,
• AMND ᴀɴᴅ MBCN ᴀʀᴇ sϙᴜᴀʀᴇs ᴛʜᴀᴛ's ᴡʜʏ ᴀʟʟ ᴄᴏʀɴᴇʀs ʜᴀᴠᴇ 90° ᴀɴɢʟᴇs .
• sᴏ, ᴛʜᴀᴛ's ᴡʜʏ , <DNA = <ANM = <MNB = <BNC = 45° { ʜᴀʟғ sϙᴜᴀʀᴇ = 45° }
• ᴀɴᴅ <ADN = <AMB = <NMB = <BCN = 90°
• ɴᴏᴡ , <ANB = <ANM + <MNB
• <ANB = 45° + 45°
• = 90°

I HOPE IT HELPS YOU.