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\\November 23, 2023 10:09 AM Surender Prajapati Proof 5 Reader _________________________ Date: ___________________74

(d) Number of obtuse angles a triangle can have is _________.
(i) 0 (ii) 1 (iii) 2 (iv) 3

(e) An equilateral triangle is also an/a _________.
(i) scalane triangle (ii) acute-angled triangle
(iii) right-angled triangle (iv) obtuse-angled triangle A

2. Write the name of the following from the adjoining figure:
(a) Vertices _________ (b) Angles _________
(c) Sides _________ B C

3. Classify the following triangles.
(a) P (b) D (c) T
3 cm 4 cm

Q 4 cm 4 cm 4 cm
6 cm R

E 4 cm F U 4 cm V

(d) X (e) Q P (f) A

95° 90° 45° 25°
60° 25° 45°
Y Z R B 125° 30° C

4. Verify the angle sum property for the following groups of angles.

(a) 30°, 90°, 60° (b) 65°, 35°, 90° (c) 80°, 75°, 35°
(d) 40°, 80°, 60° (e) 25°, 120°, 45° (f) 50°, 60°, 40°

5. Verify the property of sum of the sides of a triangle for the following.
(a) 4 cm, 3 cm, 7 cm (b) 4.5 cm, 2 cm, 4.5 cm (c) 5 cm, 6 cm, 8 cm
(d) 7 cm, 4 cm, 8 cm (e) 6 cm, 12 cm, 9 cm (f) 5 cm, 5 cm, 10 cm

circle

A circle is a simple closed figure made up of a curved line, whose each point is equidistant

from a fixed point in it.
Alternatively, we can say that a circle is the collection of all those points in a plane which

are at an equal distance from a fixed point.
The fixed point is called the centre of the circle. Coins, bangles, CDs, etc. are some examples
of circles.

140 Mathematics-5