Question

What is the measure of AC?

Answer 1

@zepdrix @mathstudent55 @Mertsj @Jonask

Answer 2

EC=180-DE since its a semi circle
and EC=AC

Answer 3

@zepdrix

Answer 4

EC=180-42=138=AC

Answer 5

Hi c: Read Jonask's notes. That should explain it fairly well.

Answer 6

Oh okay then do you do 138 divided by 90?

Answer 7

@zepdrix @Jonask ? :)

Answer 8

what do you do to the 138? :)

Answer 9

@Jonask

Answer 10

no dividing bcos DE where arc lengths ,so we just subtract ,no dividing

Answer 11

@Jonask so we subtract 138 and 90?

Answer 12

180-42=138

Answer 13

Okay then what?? @Jonask

Answer 14

Oh the answer is 138? @Jonask ?

Answer 15

@needmathhelp7 yes it is.

Answer 16

Okay thank you guys! :)