X ve y birer dar açıdır x+y=90° cotx=2 olduğuna göre cosx. siny ifadesinin değeri kaçtır​

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

Sum of the interior angles of a pentagon