Your given three angle measurements of 30, 70, and

third angle be x = 80

Step-by-step explanation:

let the third angle be x

now,

In a triangle

A + B + C = 180

Similarly,

30 + 70 + x = 180

100 + x = 180

x = 180 - 100

x = 80

thus, three angle measurements of 30, 70, and 80

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

after simplifying it i got: -36.25 as my answer. hope that !