Question

1. Find the surface area of a cube which is open at the top and whose edge is 11cm.
2. A polyhedron has 30 edges and 20 vertices. How many faces does this polyhedron
has?
3. Find the area of a trapezium with base 15cm and height 8 cm, if the side parallel
to the given base is 9cm long,
4. Two right circular cylinders of equal volume are such that their radii are in the
ratio 2:3. Find the ratio of their heights.
5. The outer diameter of a metallic pipe tube is 14 cm & thickness of the tube is 1
cm. Find the weight of 2 m long tube if the density of the metal is 7 gm/ cm.
6. An iron pipe 20 cm long has an external diameter equal to 25 cm. If the thickness
of the pipe is 1 cm, find the total surface area of the pipe​

Answer 1

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Please post the sums one by one if u want to post it together then please increase it's points!! I've send the pictures of 4 sums