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Q=It = 0.25x1 =O.25

i figure if u divide it into 2 otherwise u won't have a right angle. hence, sin 0 degrees 15.5' = x/149000000 x=671,804.0417 multiply this by 2 (coz so far u have only found the radius) hence diameter = 1,343,608.083

i'd say representation in this context is referring to techniques but i could b wrong. try asking your teacher or something.

Am 99% sure u can use ext maths formulas in physics exam but u cant use the physics formulas in ext maths exam.