Std9-Mensuration-Triangles&Circles

If two sides of a triangle are 5 cm, 12 cm and the perimeter is 30 cm , then the area of the triangle is ____

 $cm^2$  

• 30 

• 40

• 20

• 50

The perimeter of a triangular field is 450 m and its sides are in the ratio 13 : 12 : 5. Then the area of the triangle is ______

 $m^2$  

• 6750

• 4250

• 3670

• 5750

If a triangle has a base of 8 inches and a height of 4.5 inches, then its area is ______ sq inches.

• 16

• 18

• 32

• 36

The area of an equilateral triangle is 81 $\sqrt{3}$  sq cm . Find its perimeter.

• 52 cm

• 54 cm

• 26 cm

• 27 cm

 $cm^2$  

The area of the quadrilateral ABCD is _____ cm

• 300

• 326

• 336

• 356

The area of the circle that can be inscribed in a square of side 6 cm, is _____ sq cm

• 18π

• 14π

• 12π

• 9π

The radii of two circles are 4 cm and 3 cm respectively. The diameter of the circle having area equal to the sum of the areas of the two circles = ______ cm

• 5

• 7

• 10

• 14

In circle O, the radius is 4, and the measure of angle AOB is 120 degrees. Find the length of minor arc AB to the nearest integer. 

 $Take\ \pi\ =\ 3.14$  

• 5

• 9

• 8

• 6

Find the area of the shaded part given AB is the diameter of the circle with centre O and OA = 7 cm

• 66.5 sq cm

• 65.5. sq cm

• 76.5 sq cm

• 75.5.sq cm

Find the area of the shaded part given that the diameter of the inner circle is 21 cm and the uniform width of the shaded part is 10.5 cm.

• 2525.5 sq cm

• 1039.5 sq cm

• 2079 sq cm

• 1035 sq cm