From square cardboard of side 21 cm, a circle of the maximum area is cut out. Find the area of the cardboard left.
Solution:
More Solutions:
- Then the area of the resulting triangle:
- The circumference of the circle with diameter 28 cm:
- Then the radius of the circle is:
- If the ratio of the radii of two circles is 2:
- The perimeter of a semicircle (including its diameter) of radius 7 cm is:
- Area of a rectangle and the area of a circle are equal.
- Find the area of the trapezium ACDE.