Question

Given the diagram below what must 12 years ago

Answer 1

hint : oly one obtuse angle exists in a triangle

Answer 2

<C must equal 20 degrees

Answer 3

that makes A and C to have equal measures

Answer 4

Now use triangle exterior angle theorem


40 = A + C

40 = C + C

solve C

Answer 5

C=20

Answer 6

thats right !