ABC ও DEF ত্রিভুজে \(\angle\)A=\(\angle\)E = 40° , AB : ED=AC : EF এবং \(\angle\)F = 65° হলে \(\angle\)B-এর মান (a) 35° (b) 65° (c) 75° (d) 85°
Answer: C
AB:ED=AC:EF হলে,
\(\angle\)C=\(\angle\)F এবং \(\angle\)B=\(\angle\)D
\(\angle\)B=180\(^o\)-(40\(^o\)-\(\angle\)A +\(\angle\)C)
=180\(^o\)-(40\(^o\)+65\(^o\))=75\(^o\)
AB:ED=AC:EF হলে,
\(\angle\)C=\(\angle\)F এবং \(\angle\)B=\(\angle\)D
\(\angle\)B=180\(^o\)-(40\(^o\)-\(\angle\)A +\(\angle\)C)
=180\(^o\)-(40\(^o\)+65\(^o\))=75\(^o\)