1. If two sides of an isosceles triangle are 4 and 6 respectively, what is the square of the height on the bottom?

2. The circumference of an isosceles triangle is 20, and the circumference of the bottom is 6. Find the side length.

3. If the sum of the internal angles of a polygon is 1260, find the number of sides.

4. If the diagonal of the square is twice the root number 2, find the distance from the intersection of the diagonal of the square to him.

5. Simplify the root number below 5780.

30*2/3 under root numbers 2 and 3/2 is divided by 2 times under root numbers 2 and 1/2.

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