Answer: B and C
Step-by-step explanation: For A, vertical angles can be complimentary or supplementary. For D, vertical angles can sometimes be acute but not always.
It is given that the triangle is isosceles right triangle . And in an isosceles right triangle the legs are equal . Let each leg be of x units. Now we use pythagorean identity, which is
So the length of each leg is 
An ordered pair of the function is (x, y).
Function:
In math, a set of ordered pairs in which each x-element has Only One y-element associated with it is known as function.
Given,
Here we need to define the ordered pair of the function.
In order to find the order pair of the function, first we have to know the definition of ordered pair,
In math, ordered pair contains the coordinates of one point in the coordinate system.
Where a point is named by its ordered pair of the form of (x, y).
Here the first number corresponds to the x-coordinate and the second to the y-coordinate.
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