#1**+2 **

well... this triangle i beleive has a right angle and thats 90 degrease and since you are missing a number and the numbers in a triangle always add up to 180 just add 28 and 90 and whatever the answer is subtract that from 180 and that how you get the missing number *remember that there is a right angle thats why there is only one missing number . i only know that one.. i think thats right

ilovetigers123
Nov 7, 2018

#2**+2 **

Thanks, ILP......!!!!

Angle OAD is a right angle

So....Angle AOD is complementary to Angle OAD = 90 - 28 = 62° = Angle AOC

Note that Angle AOC is a central angle intercepting minor arc CA

And Angle ABC is an inscribed angle intercepting minor arc CA....so it has 1/2 the measure of AOD = (1/2) (62) = 31°

CPhill
Nov 7, 2018