Question

3.
A field is in the shape of a trapezium. One of its parallel sides is twice the other
allel side and distance between them is 100 m. If area of the field is 10,500 m²,
find the length of the parallel sides.
4
Two parallel sides DC and AB of a trapezium are 12 cm and 36 cm respectively.
If non-parallel sides are each equal to 15 cm, find the area of trapeziun.
The length, breadth and height of a cuboidal box are 2 m 10 cm,
respectively. Find the area of canvas required to cover this box.
6.
A metallic pipe is 0.7 cm thick. Inner radius of the pipe is 3.5 cm and lengur
5 dm. Find its total surface area.
THint: Total surface area = Inner surface area + Outer surface area + Area of two mis
.
A cylinder of curved surface area 1,250 m2 is formed from a rectangular metal
sheet. Find the dimensions of the rectangular sheet if its length is double
breadth.
Diameter and length of a roller are 84 cm and 120 cm respectively. In how
​

Answer 1

Answer:

Only two answers

Step-by-step explanation:

questions 5,6,7 are incomplete .

And here is the solution of 3rd and 4th

Answer 2

Answer:

3.

given; area of trapezium is10500m sq

distance between parallels (height,h)is 100m

let one parallel line is x mts then the another side is 2xmts

that is a is x mts

b is 2x mts

Step-by-step explanation:

we know that,

area of trapezium =h/2 (a+b)

=100/2 (x+2x)

=50 (3x)

=150×

but given area is 10500 mts.sq

that is

150x=10500

×=10500/500

×=21

there fore one parallel line is 21 mts

then another line is 2x21 =42 mts