Question

Can someone help me on these questions 

Find the area of an equilateral triangle with side length 11cm

Find the area of a square whose diagonal has length 12cm.

Find the perimeter of a square whose diagonal has length 6 cm

Answer 1

The area of the triangle with 11cm equilator is 52.39cm^2
The area of the square with a diagonal line of 12cm length is 72cm^2
The perimeter of the square with a diagonal line of 6cm length is 4a