Question

find the measure of arc AB.

Answer 1

can you find angle AOB first ?

Answer 2

hint : 45-45-90 triangle

Answer 3

@hartnn how do i do that

Answer 4

join OA

Answer 5

angle AOB = ...

Answer 6

oh 180

Answer 7

45+45 = 180 ????

Answer 8

i thought i had to add up all the 45's .......

Answer 9

45+45=90

Answer 10

angle AOB = 45+45 = 90
which is the central angle for arc AB

so arc AB also = 90

Answer 11

i am kinda confused on the central angle