2-D/3-D shapes: แบบฝึกหัด

Which of the following 2-D shapes has exactly \( 6 \) straight sides and \( 6 \) corners?

Which of the following 3-D shapes has exactly \( 5 \) faces, \( 5 \) vertices, and \( 8 \) edges?

Which of the following statements correctly compares a pentagonal prism and a hexagonal pyramid?

Which type of triangle has all \( 3 \) sides of the same length?

A prism has exactly \( 12 \) vertices (corners). How many flat faces does this prism have in total?

Which of the following 2-D shapes has exactly \( 3 \) axes of symmetry: a square, a rectangle, or an equilateral triangle?

A 3-D object possesses 7 flat faces, where two of them are pentagonal and the remaining five are rectangular. It also has 15 straight edges and 10 vertices. What is this shape?

A new 2-D shape is formed by joining an equilateral triangle to one side of a square. If the length of each side of the square is \( 5 \) cm, calculate the perimeter of the resulting shape.

A cylinder and a cone are both 3-D shapes that have circular components.

a) How many flat faces does a cylinder have? What is the name of the 2-D shape that forms these flat faces?

b) How many flat faces does a cone have in total?

A rectangle is a quadrilateral with specific properties.

a) Name two properties of a rectangle regarding its angles and its opposite sides.

b) If you draw a straight line (diagonal) from one vertex to the opposite vertex of a rectangle, what two identical 2-D shapes are formed?

c) If a rectangle has four equal sides, what is the special mathematical name given to that shape?