Question

Use the 45-45-90 Triangle Theorem to find the sine and cosine of a 45 angle.....

Answer 1

well the 45-45-90 triangle will have 2 sides equal and the other will be the hypotenuse

Answer 2

a 45-45-90 triangle is isoceles triangle

Answer 3

so take the equal sides as 1 then hypotenuse will be root(1^2+1^2)=root 2

Answer 4

cos 45 =adj side/hypotenuse =1/root 2

Answer 5

\[hence\ \cos 45=\frac{1}{\sqrt{2}}\]