FACTOR FOR 15 POINTS

(a-b)·z+3(b-a)^2

21

step-by-step explanation:

2160ft3

step-by-step explanation:

so mark-up is 0.4 multiplied by 180 = 72

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