Area Problems What is the diameter of the circle having 3 cm radius? 1.5 cm 8 cm 12 cm 6 cm 1.5 cm 8 cm 12 cm 6 cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Radius = Diameter/2 ? Diameter = 2 x Radius = 2 x 3 = 6 cm
Area Problems The wheel of an engine turns 350 times round its axle to cover a distance of 1.76 km. The diameter of the wheel is ?3 cm 9 cm 3 cm 3?3 cm ?3 cm 9 cm 3 cm 3?3 cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Distance covered in 1 round = (Total Distance) / (Total round)= (1.76 x 1000)/350= 176/35 m ? 2?r = (1.76 x 100) / 35 cm2? = Diameter = 17600 x 7/22 x 35 = 160 cm
Area Problems if the side of a square be increased by 4 cms. The area increased by 60 sq. cms . The side of the square is? 14cm None of these 12 cm 13 cm 14cm None of these 12 cm 13 cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let each side = x cmThen, (x + 4 )2 - x2 = 60? x 2 + 8x + 16 - x2 = 60? x = 5.5 cm
Area Problems The inner circumference of a circular race track, 14 m wide, is 440 m. Find radius of the outer circle 44 84 33 22 44 84 33 22 ANSWER DOWNLOAD EXAMIANS APP
Area Problems A person observed that he required 30 s time to cross a circular ground along its diameter than to cover it once along the boundary. If his speed was 30m/min, than the radius of the circular ground is (take ? = 22/7) 10.5 m 5.5 m 3.5 m 7.5 m 10.5 m 5.5 m 3.5 m 7.5 m ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Let the radius of circular field = r m.Speed of person in m/s = 30/60 = 1/2m/sAccording to the question,[(2?r) /(1/2)] - [(2r)/(1/2)] = 30? 4?r - 4r = 30? [4 x (22/7) - 4]r =30? (125 - 4)r = 30 ? (8.5)r = 30? r = 30/8.5 = 3.5 m
Area Problems The ratios of areas of two squares, one having its diagonal double than the other is 3:1 2:1 2:3 4:1 3:1 2:1 2:3 4:1 ANSWER DOWNLOAD EXAMIANS APP
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