Page 182 - Start Up Mathematics_4

(c) (d)

7. Look at the following pictures and answer the questions.

30 cm
(a) What is the perimeter of the frame that
is required to frame this painting?
18 cm

(b) The playground near Raju’s house 200 m
is as shown. If Raju runs around
the ground thrice, find the distance 140 m 140 m
covered by him.
200 m

10 km
(c) The given figure shows the path covered
by Rajat in a car rally. Find the perimeter 6 km 4 km 80 m 3 km 15 m
of the path to know how much distance 4 km 4 km 2 km 20 m
he travelled. 2 km

2 km 6 km 35 m
Symmetry

You have studied about symmetry in your previous class. Let’s line of
quickly review it with the help of the given activity. symmetry
Take a sheet of paper and fold it from the centre. Open it and
put a drop of ink on the line of fold. Fold the sheet again. Press
the sheet two to three times and open it again. You will see a
figure which is symmetrical about the line of fold.

The line of fold that divides the figure into two equal halves
is called the line of symmetry. symmetric figure

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