43.78 = forty three and seventy eight hundredths.
Let the two sides of a right triangle be equal to one, which means that the hypotenuse is √2
Since cosa=adjacent side / hypotenuse
cos45=1/√2
We can rationalize the denominator by multiplying numerator and denominator by √2
√(2)/2
or if you prefer: √(1/2)
Hello!
since this is a 45-45-90 degree triangle the hypotenuse is a

where a is one of the legs
So the answer is 5

Hope this helps!
Answer:
2700 I believe
Step-by-step explanation: