What is the perimeter of this rectangle?

A.

Step-by-step explanation:

I see the bottom vertices are (x1, y1) and x2, y1).

I assume the top vertices are (x1, y2) and (x2, y2).

If that is correct, the the lengths of the top side and bottom side are x2 - x1.

The lengths of the left side and right side are y2 - y1.

Since there are two horizontal sides and two vertical sides, the perimeter is:

2(x2 - x1) + 2(y2 - y1)

Choice A.

something that characterises a right triangle is the fact that we may use pythagoras' theorem to find any one of its sides given that we have the length of the other two sides. here, we have the length of the hypotenuse, √(87) yd, and one other side, √(23) yd, thus we can easily find the length of the remaining side using pythagoras' theorem as defined below:

c^2 = a^2 + b^2, where c is the length of the hypotenuse, and a and b are the lengths of the other two sides.

thus, given that c = √(87) and a = √(23), we may substitute these into the formula we defined above to get:

c^2 = a^2 + b^2

(√87)^2 = (√23)^2 + b^2 (substitute c = √87 and a = √23 into the equation)

87 = 23 + b^2 (evaluate (√87)^2 = 87 and (√23)^2 = 23 - remember that the square root of a number, squared will equal that very same number)

64 = b^2 (subtract 23 from both sides)

√64 = b (take the square root of both sides)

8 = b (evaluate √64 = 8)

therefor, the length of the unknown leg in the right triangle is 8 yd (first answer).