The sizes of the interior angles of a triangle are in the ratio 1:3:8 Calculate the difference in size between the largest and smallest angles.

Please answer me!

we know that

1) the inscribed angle measures half of the arc it comprises.

so

m∠dgf= > expression

2) the opposite angles in an inscribed quadrilateral are supplementary angles

so

m∠dgf=

m∠dgf=°

substitute in the expression to find the value of arc ef

therefore

the answer is

the measure of the arc ef is

x=-9/4,x=-5/3

step-by-step explanation:

i   want to say the correct answer is 12,000 correct me if i'm wrong