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    Regular heptagon, finding value of unknowns

    Homework Statement Homework Equations (n-2)*180[/B] The Attempt at a Solution 11.a: 7-2=5, 5*180= 900. 900/7= 128.57 degrees b. How do you find the unknowns?[/B]
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    Interior angles of a polygon

    Homework Statement Homework Equations sum interior angles (n-2)*180 angles of a quadrilateral: a+b+c=d = 360 [/B] The Attempt at a Solution What do you do with the exterior angle? 80+130+a+x=360
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    Isosceles triangle with angle bisector

    Homework Statement Find x[/B] Homework Equations a+b+c=180[/B] The Attempt at a Solution ADB= 65+65+50=180 How do I find x in DBC?
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    Isosceles triangle angles

    Homework Statement Find x[/B] Homework Equations a+b+c=180 [/B] The Attempt at a Solution So RP=RQ, the base angles are x and (146-x), normally the base angles are the same but in this scenario they are different. x+146-x+?=180
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    Scalene triangle angles

    Homework Statement The three angles of a scalene triangle are x degrees, (x-12) degrees and (2x+6) degrees. What sizes are the angles?[/B] Homework Equations Triangle = a+b+c =180 Scalene = no equal size or angles[/B] The Attempt at a Solution So what do you do with (x-12) degrees and...
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    Angle properties: Angles centered at a point?

    Homework Statement Find what x is I don't understand what to do with (3x-23). Homework Equations Angles centered at a point: a+b+c+d=360 https://drtayeb.files.wordpress.com/2011/03/igcse-math-extended.pdf (here is a pdf of the textbook, Exercise 4A, 3i.)[/B] The Attempt at a Solution...
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