Question

if O is the center of the cirlce ,BC =10 and OC=13 find OA.

Answer 1

upload the picture you had before please

Answer 2

ok so from the image since OA goes straight down and BC is perpendicular to OA then we know that OA cuts exactly half the length of BC.

so BC length = 10 --> 10/2 = 5 and we know OC = 13

so we can use pythagorean's theorem to find OA.

OA^2 + BC^2 = OC^2
so
OA^2 + 5^2 = 13^2

OA^2 = 325

OA = 18.0278

Answer 3

OA^2 = 144

Answer 4

so what theorem would you use to find what an arc measures?

Answer 5

mouse is correct 169-25=144