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8

Sheila is given three straws to form a frame in the shape of a right-angled triangle. The
straws are 15 cm, 20 cm and 25 cm long respectively. Will she be able to form the frame
in the shape of a right-angled triangle?

15 + 20 = 225 + 400
2
2
= 625
2
25 = 625
2
2
15 + 20 = 25
2
Therefore, Sheila will be able to form the frame in the shape of a right-angled triangle.
Self Practice 13.2b

1. A 2.5 m long ladder leans against the wall of a
building. The base of the ladder is 1.5 m away 2.5 m
from the wall. Explain how you would determine 2 m
whether the wall is vertical.

1.5 m
2. In the diagram, find ∠PQR. 6 m Q
P R
65°
10 m 8 m
45°

S

13.2 Open the folder downloaded from page vii for extra
questions of Mastery Q 13.2.
1. Explain whether the lengths of sides in each of the following can form a right-angled
triangle:
(a) 9 cm, 40 cm, 41 cm (b) 27 m, 45 m, 35 m
(c) 2.5 cm, 6 cm, 6.5 cm (d) 13 m, 84 m, 85 m
2. A carpenter wishes to fix a triangular piece of wood
measuring 12 cm, 16 cm and 20 cm onto a L-shaped
wooden structure, as shown in the diagram. Explain
whether the triangular piece of wood can be fixed
perfectly onto the L-shaped structure.
CHAPTER
13
3. Kanang draws a quadrilateral with measurements as shown 20 cm
in the diagram. What is the name of the quadrilateral he
has drawn? Explain. 25 cm 15 cm
15 cm

20 cm

302
Chapter 13

13 TB Math F1.indd 302 11/10/16 12:22 PM