Answer them all plzzzz
2.Find the height of a Trapezium, the sum of lengths of whose bases is 80 cm and whose area is 800 CM²
3.The area of a trapezium is 210 CM² and its height is 14 cm. If one of the parallel sides is longer than the other by 12 cm find the two parallel sides.
4.The volume of a cuboid is 70 cm³ the area of the base is 10 sq. cm. Find the height.
5. How many bricks of size 6 CM by 20 CM by 7 CM will be required to build a wall, 15 M by ½M by 7 M?
6. find the volume of a cube whose total surface area is 154 cm²
7.cuboid kal tank is build 60cm x 40cm x 30cm. How many litres of water it can hold.
8. Capacity of a tank is 5000 litre. If its length is 5 cm and breadth is 4 metre find its depth in centimetre.
9. how many full bags of weight can be emptied into a circular drum of radius 4.2 metre and height 3.5 metre. If space required for one bag of wheat is 2.1m³
Answers
Step-by-step explanation:
2) Let h be the height of trapezium.
Given: Sum of Base of trapezium (b1+b2)=60 cm
Area of trapezium =600 cm2
⇒600=21×(b1+b2)×h
⇒600=21×60×h
⇒h=60600×2
⇒h=20
∴ Height of trapezium =20 cm
3)One parallel side =12m, distance between parallel side =15m
Area =210m2
Let x be other parallel side
Area of trapezium=21×Sum of parallel sides×Distance between them.
Area =21×15×(12+x)
210=215(12+x)
28=12+x
x=16m (Answer)
4) ??
5)20mm
6)Surface Area =154 square cm.
4πr2=154
r2=4×22154×7=449
r=27 cm
Volume,
V=34πr3
V=34×722×(27)3
V=179.66 cm3
7) Given cuboidal tanks having,
Length(l)=30cm
Breadth(b)=30cm
Height(h)=1m 60cm
=100cm+60cm
=160cm
Given, Cuboidal tank already has petrol till height 40cm.
To find: cm3 of vmore petrol that tanks can contain.
Sol: Volume of max petrol that tanks can contain=(Totalvolumeoftank)−(volumeofcuboidaltanktakingheight40cm)
[using formula → Volume of cuboidal=l×b×h]
We get,
Required volume=[(30×30×160)−(30×30×40)]cm3
=30×30[160−40]cm3
=30×30×120cm3
=108000cm3.
8) Volume of cubiod=50000litres=60m3
1000litres=1m3
lbh=10×4×h=5
height=4060=1.5m
9)r=4.2 m
h=3.5 m
Volume of the drum = πr2h=[3.14×(4.2)2×3.5] m3
The volume of each bag of wheat =2.1 cubic meter
Number of bags = 2.13.14×4.2×4.2×3.5=92.316=92 bags nearly