7. kévin claims he can draw a trapezoid with three
right angles. is this possible? explain.

No

Step-by-step explanation:

It could not have 3 right angles.  If it did, it would be a rectangle.

its 4 because 2 times 2 is 4, if you double the number two you get four

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2