Samacheer Kalvi Class 5 Maths Solutions Term 1 Chapter 1 Geometry Exercise 1.1

Question 1. Match the following
Answer:
(i) Ball - Sphere
(ii) Dice - Cube
(iii) Rectangular Block - Cuboid
(iv) Cone - Cone
(v) Cabinet - Cuboid
In simple words: We connect each picture of an object to its correct 3D shape name. Many everyday things look like these basic shapes.

🎯 Exam Tip: When matching, carefully look at the features of each object, like its sides, corners, and overall shape, to pair it with the correct geometric name.

Question 1. Cube has by 6 square faces.
Answer: True - A cube has six equal square faces. All sides of a cube are the same length.
In simple words: Yes, a cube has six sides, and each side is a perfect square, all the same size.

🎯 Exam Tip: Remember that all six faces of a cube are identical squares, which makes it a special type of cuboid.

Question 2. The height and slant height of the cone are equal
Answer: False - The height and slant height of a cone are not equal. The slant height is the distance from the tip to any point on the edge of the base, making it longer than the straight height inside. The slant height forms the hypotenuse of a right-angled triangle with the height and base radius.
In simple words: No, they are not equal. The slant height is always longer because it goes down the side of the cone, while the height goes straight down the middle.

🎯 Exam Tip: Visualize a cone and remember that the height is straight up, while the slant height goes along the slanted surface, similar to a slide.

Question 3. A Cuboid has 7 vertices.
Answer: False - A cuboid has 8 corners, which are called vertices. Each vertex is where three edges meet.
In simple words: No, a cuboid actually has 8 corners. Think of a brick or a shoebox.

🎯 Exam Tip: You can easily count the vertices (corners) on any rectangular box-like object to confirm a cuboid has 8.

Question 4. Two bases lie in upper and lower surfaces of a cylinder.
Answer: True - A cylinder indeed has two bases: one circular base at the top and another identical circular base at the bottom. These bases are always parallel to each other.
In simple words: Yes, a cylinder has a round base at the top and another round base at the bottom.

🎯 Exam Tip: Remember that the two circular bases of a cylinder are always congruent (the same size and shape) and parallel.

Question 5. Sphere is a 3D Shape.
Answer: True - A sphere is a three-dimensional (3D) shape. It is perfectly round, like a ball, and has depth, width, and height. It is a solid figure, not a flat one.
In simple words: Yes, a sphere is a 3D shape. It's like a ball, which takes up space in all directions.

🎯 Exam Tip: Understand that 3D shapes have length, width, and depth, while 2D shapes (like a circle) only have length and width.