Area Problems The altitude of an equilateral triangle of side 2 ? 3 cm is? ? 3/2 cm ? 3/4 3 cm 1/2 cm ? 3/2 cm ? 3/4 3 cm 1/2 cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? 1/2 x 2 ? x h = ?3/4 x (2 ?3)2? h = 3 cm.
Area Problems The ratios of areas of two squares, one having its diagonal double than the other is 2:3 3:1 2:1 4:1 2:3 3:1 2:1 4:1 ANSWER DOWNLOAD EXAMIANS APP
Area Problems Find the area of the trapezium, whose parallel sides are 12 cm and 10 cm, and distance between the parallel sides is 14 cm? 186 sq.com 164 sq.com 121 sq.com 154 sq.com 186 sq.com 164 sq.com 121 sq.com 154 sq.com ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Area of trapezium = 1/2 x (Sum of parallel sides) x (Distance between Parallel sides) = 1/2 x (12 + 10) x 14 = 22 x 14/2 = 22 x 7 = 154 sq. cm
Area Problems A circular disc of area 0.49 ? square meters, rolls down a length of 1.76 km. The number of revolutions it makes is? 600 4000 300 400 600 4000 300 400 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Area = ?r2 = 0.49? ? r = 0.7 mNumber of revolutions = total distance / circumference = (1.76 x 1000) / (2 x 22/7 x 0.7) = 400
Area Problems The area of circle is 38.5 sq. cm. Its circumference is? 11 cm 22 cm 6.20 cm 121 cm 11 cm 22 cm 6.20 cm 121 cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP ? ( 22 x r2) / 7 = 38.5? r2 =(38.5 x 7) /22? r = 3.5 cm? Circumference = 2 x (22/7) x 3.5 cm= 22 cm
Area Problems Radhika runs along the boundary of a rectangular park at the rate of 12 km/hr and completes one full round in 15 minutes. If the length of the park is 4 times its breadth , the area of the park is? 3600 m2 None of these 360000 m2 360002 3600 m2 None of these 360000 m2 360002 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Speed = 12 x (5/18) m/sec =10/3 m/sec there4; perimeter = (10/3) x 15 x 60 m=3000 m? 2( a + 4a) = 3000 m? a = 300 mSo, length = 1200 m and breadth = 300 m ? Area = (1200 x 300 ) m2 = 360000m2
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