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A rectangular piece is 20 m long and 15 m wide. From its four corners, quadrants of radii 3.5 m have been cut. Find the area of the remaining part.
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The inside perimeter of a running track (shown in Fig. 20.24) is 400 m. The length of each of the straight portion is 90 m and the ends are semi-circles. If track is everywhere 14 m wide, find the area of the track. Also, find the length of the outer running track.
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Find the area of Fig. 20.25, in square cm, correct to one place of decimal. (Take π = 22/7)
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The diameter of a wheel of a bus is 90 cm which makes 315 revolutions per minute. Determine its speed in kilometres per hour. [Use π = 22/7]
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Plot the points (2, 8), (7, 8) and (12, 8). Join these points in pairs. Do they lie on a line? What do you observe?
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13 and 31 is a strange pair of numbers such that their squares 169 and 961 are also mirror images of each other. Find two more such pairs.
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If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2.5 kilograms?
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- How far will it travel in 20 minutes?
- Find the time required to cover a distance of 250 km.
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A number which can be expressed as `p/q` where p and q are integers and q ≠ 0 is ______
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A number of the form `p/q` is said to be a rational number if ______.
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The numerical expression `3/8 + ((-5))/7 = (-19)/56` shows that ______
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Which of the following is not true?
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The equivalent of `5/7`, whose numerator is 45 is ______.
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The equivalent rational number of `7/9`, whose denominator is 45 is ______.
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The rational number 10.11 in the from `p/q` is ______.
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