Distance=rate times time distance=460 rate-wind=rate against wind rate+wind=rate with wind 2.5=time aginst wind 2=time with wind so 460=(rate-wind) times 2.5 and 460=(rate+wind) times 2
solve for rate 460=(rate-wind) times 2.5 divide both sides by 2.5 184=rate-wind
460=(rate+wind) times 2 divide by 2 230=rate+wind
we have 184=rate-wind 230=rate+wind add them
184=rate-wind <u>230=rate+wind + </u>414=2rate+0wind 414=2rate divide by 2 207=rate
A tangent forms a right angle with the centre of circle at the point it touches the circumference. i.e. OAB = 90 degrees If AOB = 55 degrees, then ABO = 90 - 55 = 35 degrees
