Class 7 Maths

# Solid Shapes

## Exercise 15.3

Question 1: What cross-sections do you get when you give a (i) vertical cut (ii) horizontal cut

To the following solids: (a) A brick, (b) A round apple, (c) A die, (d) A circular pipe, (e) An ice cream cone

Answer: (a) Rectangle in both sections, (b) Circle in both sections, (c) A square in both sections, (d) Rectangle in vertical section and circle in horizontal section, (e) Triangle in vertical section and circle in horizontal section.

### Exercise 15.4

Question 1: A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow.   Answer: (i) Circle, (ii) Rectangle, (iii) Rectangle

Question 2: Here are the shadows of some 3 – D objects, when seen under the lamp of an overhead projector. Identify the solid (s) that match each shadow.    Answer: (i) Spherical, (ii) Cube, (iii) Pyramid, (iv) Cuboid

Question 3: Examine if the following are true statements:

1. The cube can cast a shadow in the shape of a rectangle.
2. The cube can cast a shadow in the shape of a hexagon.