The answer should be C, 21. I’ll attach a picture for explanation.
Answer:
30
Step-by-step explanation:
This problem can be done without the Distance Formula (which is a way to find the distance between any two points in the plane).
The attached image shows the points and segments joining them.
PQ = 5 because the points are on the same horizontal line, and you can count spaces between them (or subtract x-coordinates: 4 - (-1) = 5).
PR = 12 because the points are on the same vertical line; count spaces or subtract y-coordinates, 7 - (-5) = 12.
The triangle is a right triangle, so the Pythagorean Theorem can be used to find the length of the hypotenuse.


The perimeter of the triangle is 5 + 12 + 13 = 30
D= 65 degrees.
Because straight line adds up to 180
So 180-115= 65
Answer:
The next two terms are 14 and 20.
Step-by-step explanation:
This is because the pattern is add 6, so you add 6 to 8 which equals 14, then 14 plus 6 equals 20.
Step-by-step explanation:
x= 10 sin 60° = 10×½√3 = 5√3
y= 10 cos 60° = 10×½ = 5