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Circumcentre or circumradius of the triangle formed by a pair of lines and a third line

This type of question, asked 2 times: 22 Apr 2025 S2, 26 Apr 2025 S1. All 2 questions below, oldest first.

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  1. Question 1

    22 Apr 2025 S2

    130
    The circumradius of the triangle formed by the lines xy+2x+2y+4=0xy + 2x + 2y + 4 = 0 and x+y+2=0x + y + 2 = 0 is

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  2. Question 2

    26 Apr 2025 S1

    128
    The circumcenter of the triangle formed by lines xy+2x+2y+4=0xy+ 2x+ 2y+ 4 = 0 and x+y+2=0x+y+ 2 = 0 is

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