Question

2. In the given figure, AABC is an equilateral triangle and ABDC is a
cyclic quadrilateral, and then find the measure of BDC.​

Answer 1

Answer:

△ABC is an equilateral triangle.

∴ ∠BAC = 60°

Now, ∠BDC + ∠BAC = 180°

∠BDC + 60° = 180°

∠BDC = 180° - 60°

∠BDC = 120°

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

ᴀʙᴄ ɪs ᴀɴ ᴇǫᴜɪʟᴀᴛᴇʀᴀʟ ᴛʀɪᴀɴɢʟᴇ.

∴ ∠ʙᴀᴄ = °

ɴᴏᴡ, ∠ʙᴅᴄ + ∠ʙᴀᴄ = °

∠ʙᴅᴄ + ° = °

∠ʙᴅᴄ = ° - °

∠ʙᴅᴄ = °

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