Learn Class 8 Math - Visualising Solid Shapes

Solids have a hard and fast form and occupy a space. A shape is made from polygonal regions referred to as its faces.

Two Dimensional Object

A form with the handiest dimensions (duration and width) and no thickness is known as a -dimensional form. Squares, Circles, Triangles, and so on are -dimensional objects. Also regarded as “2D”.

Three Dimensional Objects - Solids

Shapes that may be measured in three instructions are referred to as third-dimensional shapes. These shapes also are referred to as strong shapes. Their dimensions are length, width, and height (or intensity or thickness).

Solids and Their Classification

  • Hexagon - In geometry, the hexagon is a polygon with 6 facets. The Sum of all inside angles is the same as 720°. If all of the facets of the hexagon are the same, then it's far known as an ordinary hexagon, then every indoors perspective measures 120°.
  • Non-Polyhedrons - Solids with curved faces are known as Non-polyhedrons. They also may be defined as solids with facets that aren't polygons. Example: Sphere, Cylinder, Cone, etc.
  • Prism - A prism is a solid whose aspect faces are parallelograms and whose ends (or bases) are congruent parallel polygons.

Learning Videos for 8th Grade Math - Visualising Solid Shapes

Visualising Solid Shapes Sample Questions for Class 8

Question 1

How many diagonals a regular decagon can have?
A. 50
B. 62
C. 35
D. 25

Question 2

Which regular polygon has sum of all interior angles 1260?
A. Nonagon
B. Octagon
C. Septagon
D. Decagon

Question 3

Which of the following statement is incorrect?
A. In a convex quadrilateral each angle is more than 180
B. Both diagonals lie in interior to quadrilateral
C. Regular pentagon is a example of convex quadrilateral
D. A and C

Question 4

Which of the following statement is incorrect?
A. Sum all angles of quatrilateral is 360
B. Sum of all exterior angles of a polygon is 360
C. Each interior angle of a regular polygon is 360/n, where n is number of sides
D. Each interior angle and a exterior angle forms a linear pair

Question 5

The diagonals of rhombus are 12cm and 16cm. Find the perimeter of the rhombus.
A. 72 cm
B. 56 cm
C. 28 cm
D. 40 cm