How to find a 90 degree angle

See explanation

Step-by-step explanation:

See if there's a right angle. A right angle will have a little box.

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.