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@MathGuyTFL A is 12
2(A+5)=34
Distribute the 2
2(A)+2(5)=34
Multiply
2A+10=34
Subtract 10 from both side
2A+10-10=34-10
2A=24
Divide two from both sides
2A/2=24/2
A=12
@Beno10_MFC The line that intersects the triangle makes the lower part a quadrilateral. A the sum of quadrilateral's angles is 360°
180°-45°=135°
360°-135°-60°-60°
225°-60°-60°
165°-60°
105°
Since the missing angle is congruent to the 105° then the missing angle is also 105°
@SqSehrish There's 13 for this riddle The man, the 11 sons and the one sister because the 11 sons have the same sister. Some can say 14 but there's no mention of spouse/partner so it 13