Question

find the missing angle in the quadrilateral

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Answer 1

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ꜱᴜʙᴛʀᴀᴄᴛ ᴛʜᴇ ꜱᴜᴍ ᴏꜰ ᴛʜᴇ ᴀɴɢʟᴇꜱ ꜰʀᴏᴍ 180 ᴅᴇɢʀᴇᴇꜱ ᴛᴏ ɢᴇᴛ ᴛʜᴇ ᴍɪꜱꜱɪɴɢ ᴀɴɢʟᴇ. ꜰᴏʀ ᴇxᴀᴍᴘʟᴇ ɪꜰ ᴀ ᴛʀɪᴀɴɢʟᴇ ɪɴ ᴀ Qᴜᴀᴅʀɪʟᴀᴛᴇʀᴀʟ ʜᴀᴅ ᴛʜᴇ ᴀɴɢʟᴇꜱ ᴏꜰ 30 ᴀɴᴅ 50 ᴅᴇɢʀᴇᴇꜱ, ʏᴏᴜ ᴡᴏᴜʟᴅ ʜᴀᴠᴇ ᴀ ᴛʜɪʀᴅ ᴀɴɢʟᴇ ᴇQᴜᴀʟ ᴛᴏ 100 ᴅᴇɢʀᴇᴇꜱ (180 - 80 = 100).

$\pink{ \rule{7cm}{0cm}}$