Consider the diagram.
What is the length of segment AB?
A. 7
B. 9
C. 18
D. 25

18

Step-by-step explanation:

Since, in the diagram, it shows 9 as half of one side of the triangle.

We'll call the mark with 9 E.

Since BE= 9

then to find length of segment AB,

we would simply multiply the value of BE, 9, by 2 to get the length of segment AB= 18.

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: