1) the center of a circle is at (-10,6) and it has a radius of 4. what is the equation of the circle?
2)(look at 1st attached pic)
0.6
1.4
1.2
0.7
3) (look at second attached pic)
4(look at last attached pic)

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

1

step-by-step explanation:

it's the only multiple of both and the least