$\"\"$

The area of the rectangle with base b and height h is $\"\"$ . \ \

The area of the triangle with base b and height is $\"\"$ .

From the figure, $\"\"$ . \ \

$\"\"$ .

Radius of the circle is 1. \ \

$\"\"$

$\"\"$ .

The area of the triangle $\"\"$

$\"\"$

Area of rectangle is equal to area of triangle. \ \

$\"\"$

Therefore Area of rectangle is equal to area of triangle at $\"\"$ .

$\"\"$

Area of rectangle is equal to area of triangle at $\"\"$ .