Needs ab ⊥ ac true or false idk i think it’s false

Needs ab ⊥ ac true or false idk i think it's false

9. Find the area of a circle having a circumference of 382. Round to the nearest tenth. Use 3.14 for 1. a. 1133.5 units b. 1078.6

1. Expert says:

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.
$Find the surface area of the cylinder.give your answer in terms of pi.$

2. montanolumpuy says:

Perpendicular means the slopes are opposite inverse of each other
If line a is slope 2, the perpendicular line to Line a would have a slope - 1/2
Difference in y over difference in x gives slope. If they are opposite inverse values the lines are perpendicular. ( in this case the answer is true.)

3. Expert says:

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation: