Qualification > Math

ON 08 P4 HELP MATH!!

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angell:
thank u so much for the prompt replies!!:D

theigstudent:

--- Quote from: astarmathsandphysics on May 17, 2009, 11:05:24 pm ---OAB is isoceles since )A and OB are radii. therefore y=(180-130)/2=25

ST and Ob are parelell so by Z rule x=40
ABC and ADB sum to 180 so z=180-(25+40)=115

--- End quote ---

how to get y =25


n Thanks a lottttt for such instant replies

twilight:
like astar said .. AO and OB are equal bcoz they r radii .. so triangle AOB is isosceles ..
the sum of the angles is 180 .. so
angle OAB = angle OBA             and     OAB + OBA + 130 = 180    =>   OBA + OBA + 130 = 180

so 2y + 130 = 180            => y=25

theigstudent:
oh ya  it so simple
Thanks a lot ppl
i needa go because in next six hours i have to reach ma school 4 exam
best of luck to every1

archangel:
ahh i need help, my exam is in 3 hours  :-\

do u guys know q7 part d)

why is the answer 57?
shouldnt it be 180-(78 x 2) = 24?

because if its isoceles than i can use that method right?

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