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20. Mensuration-I (Area of a Trapezium and a Polygon)
Home · Class 8 · Maths · Ref. Book · 20. Mensuration-I (Area of a Trapezium and a Polygon)
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Q6 of 47 Page 20

Find the area of Fig. 20.25, in square cm, correct to one place of decimal. (Take π =22/7)

Area of the figure = area of square + area of semi circle – area of right angled triangle


Area of the figure = side × side +


Area of the figure = 10 × 10 +


Area of the figure = 100 + 78.57 - 24


Area of the figure = 100 + 78.57 – 24 = 154.57 cm2


Area of the figure = 154.57 cm2


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4

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.

5

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.

7

The diamerer of a wheel of a bus is 90 cm which makes 315 revolutions per minute. Determine its speed in kilometres per hour. (Take π=22/7)

8

The area of a rhombus is 240 cm2 and one of the diagonal is 16 cm. Find another diagonal.

Questions · 47
20. Mensuration-I (Area of a Trapezium and a Polygon)
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