Area MCQs

If every side of a triangle is doubled, the area of the new triangle is K times the area of the old one. K is equal to :

The area of a circle of radius 5 is numerically what percent of its circumference ?

A wire can be bent in the form of a circle of radius 56 cm. If it is bent in the form of a square, then its area will be :

The circumference of the front wheel of a cart is 40 ft long and that of the back wheel is 48 ft long. What is the distance travelled by the cart, when the front wheel has done five more revolutions than the rear wheel ?

In the given diagram, ABCD is a square and semi-circular regions have been added to it by drawing two semi-circles with AB and CD as diameters. If the total area of the three regions is 350 sq.cm, then the length of the side of the square is equal to :

The radius of the circum-circle of an equilateral triangle of side 12 cm is :

Three circle of radius 3.5 cm are placed in such a way that each circle touches the other two. The area of the portion enclosed by the circles is :

The height of a triangle is equal to the perimeter of a square whose diagonal is $$8\sqrt 2 $$ metre and the base of the same triangle is equal to the side of a square whose area is 729 sq.metre. What is the area of the triangle ? (in sq. metre)

The ratio of length and breadth of a rectangle is 3 : 2 respectively. The respective ratio of its perimeter and area is 5 : 9. What is the breadth of the rectangle in metres ?