First off both triangles form a 90° angle there both congruent. you can tell they form a 90° angle because of square box
The answer is 4 let's make a equation to answer it 3*y=12 we need to get y simply multiply 1*3=3 2*3=66 is half way so we can double 2 to 4 4*3=12 so y=4. you only need 4 boards to complete the wall.
Answer:
Step-by-step explanation:
e34
Solution :
It is given that :
lies in the first quadrant.
And 
lies in the fourth quadrant.
Since, 
and 
(given)
Similarly
(IVth quadrant)
Therefore,
