Question

1.Click 2 pictures (if doing on tab)OR collect 2 pictures of objects from real life with rotational symmetry.(if doing on paper) 2.Discuss the order of rotational symmetry of both of them using rotation tool of tab / by repeatedly sticking pictures.(on paper) 3.Discuss the degree of rotational symmetry of these objects. 4.What will be the order of rotational symmetry for a starfish with 5 arms. Find it's degree of rotation too. 5. Is it correct to say that ' There is no object with order of rotational symmetry as 0' . Justify this statement. (Each criterioron carries 2 marks) Pls note it is an individual activity.

Answer 1

hi thank you for asking the question 
in the 1st two pics is example of rotational symmetry

When describing geometric shapes, the following vocabulary may be used:

Equilateral: having all sides congruent.
Equiangular: having all angles congruent.
Regular: both equilateral and equiangular.

For triangles and trapezoids, those with two sides congruent are isosceles.

for both of them the angle of rotational symmetry is 120 degree

For a star fish with 5 arms the rotational symmetry can be found as

1/5*360= 72 so every arm will be at 72 degree