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\\November 3, 2023 12:44 PM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74
Three planes of symmetry are parallel to the surfaces and six planes of symmetry are
diagonals.
Quick Check
A cuboid has three planes of symmetry. Identify them in the following.
1. 2. 3.
4. 5. 6.
Get it right!
The plane shown alongside cuts the cuboid into two equal
halves, so it is a plane of symmetry. A
It is not a plane of symmetry because the vertex A of the
A'
cuboid when reflected across the plane, the image, A', is not
mapped to the other half of the cuboid.
Practice Time 8A
1. Fill in the blanks.
(a) An isosceles triangle has ________ line of symmetry.
(b) A rectangle has ________ lines of symmetry.
(c) An equilateral triangle has ________ lines of symmetry.
(d) A circle has ________ lines of symmetry.
(e) A letter 'H' has ________ lines of symmetry.
2. Draw the line(s) of symmetry for the following shapes.
(a) (b) (c)
168 Mathematics-5
