Find the area of a room which is 16 m long. 12 m broad and 5 m high.Find the area of a room which is 16 m long. 12 m broad and 5 m high.
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Solution
Area = 2 (l + B) × h
= 2 (16 + 12) × 5
= 280 m2
Find the area of an equilateral triangle whose side is 4 cm.
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Solution
Find the diagonal of a rectangle whose sides are 12 cm and 5 cm.
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Solution
Diagonal = = 13 cm
In a trapezium, parallel sides are 30 and 40 cms respectively and distance between parallel sides is 15 cm. Find the area of trapezium.
In a parallelogram, the lengths of adjacent sides are 12 cm and 14 cm respectively. If the length of one diagonal is 16 cm, find the length of the other diagonal.
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Solution
= 2 (a2 + b2)
256 + D22 = 2((12)2 + (14)2)
D2 = 20.6 cm
A man can row 15 km/hr in still water. When the river is running at 5 km/hr, it takes 4 hours and 30 minutes to row to a place and back. How far is the place?
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Solution
Let the distance be x km
∴
∴ x = 30 km
In one hour a boat goes 17 km along the stream and 7 km against the stream. Find the speed of stream in still water.
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Solution
Speed of stream = = 5 km/hr
A boat whose speed is 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream is.
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Solution
Let the speed of strteam is x
∴
∴ = 5 km /hr
A boat can travel with a speed of 12 km/hr in still water. If the speed of stream is 4 km/hr. Find the time taken by the boat to go 64 km downstream.
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Solution
Time = = 4 hr
If x + = 2 then find the value of x17 + .