What are the sine and cosine ratios for a 45 -45 -90 triangle with a leg of 4?

Louise measured the perimeter of her rectangular scrapbook to be 154 cm. if the scrapbook is 45 cm wide, how long is the scrapbook?

If the discriminant if a quadratic equation is 4 which statement describes the roots?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i