Area Problems A park of 10 meters long and 8 meters broad. What is the length of the longest pole that can be placed in the park? 12.8 metres 18 metres 10 metres 13.4 metres 12.8 metres 18 metres 10 metres 13.4 metres ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Length of the longest pole = ? [(10)2 + (8)2] m = ? 164 m = 12.8 m
Area Problems A tank is 25m long 12m wide and 6m deep. The cost of plastering its walls and bottom at 75 paise per sq m is Rs. 458 Rs. 258 Rs. 558 Rs. 358 Rs. 458 Rs. 258 Rs. 558 Rs. 358 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Area to be plastered = 2 l + b × h + l × b = 2 25 + 12 × 6 + 25 × 12 = 744 s q . m Cost of plastering = 744 × 75 100 = R s . 558
Area Problems The length of minute hand of a wall clock is 7 cms. The area swept by minute hand in 30 minutes is? 77 sq. cm 154 sq. cm 147 sq. cm 210 sq. cm 77 sq. cm 154 sq. cm 147 sq. cm 210 sq. cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Angle swept in 30 min= 180° Area swept = [(22/7) x 7 x 7] x [180°/360°] cm2 = 77 cm2
Area Problems The inner circumference of a circular race track, 14 m wide, is 440 m. Find radius of the outer circle 84 33 22 44 84 33 22 44 ANSWER DOWNLOAD EXAMIANS APP
Area Problems The diameter of the driving wheel of a bus is 140 cm. How many revolution, per minute must the wheel make in order to keep a speed of 66 kmph ? 150 250 550 350 150 250 550 350 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Circumference = No.of revolutions * Distance covered Distance to be covered in 1 min. = (66 X1000)/60 m = 1100 m.Circumference of the wheel = 2 x (22/7) x 0.70 m = 4.4 m.Number of revolutions per min. =(1100/4.4) = 250.
Area Problems The area of an equilateral triangle is ? 243 /4 sq cm. Find the length of its side. 3?3 cm ?3 cm 3 cm 9 cm 3?3 cm ?3 cm 3 cm 9 cm ANSWER EXPLANATION DOWNLOAD EXAMIANS APP According to the question,area = ?3a2/4 = ?243 /4? a2 = ?81 x 3/?3 ? a = ?9 = 3 cm
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