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10.3 Open the folder downloaded from page vii for extra
questions of Mastery Q 10.3.
1. The width of a rectangular cardboard is 24 cm and its area is 960 cm . Find the
2
perimeter of the cardboard.
2. The perimeter of a rectangle is 48 cm. Explain how you should draw the rectangle so
that the area is the largest. What is the largest area?
S V R
3. The diagram shows a piece of rectangular tile
PQRS. A kite shape TUVW is inscribed in the W
rectangle. Given that the perimeter of PQRS is U
12 cm
120 cm, find the area of TUVW.
P T 28 cm Q

4. A plot of rectangular land is divided into 3 sections, P,
Q and R to plant three types of vegetables. The perimeter P R
of the land is 170 m and the length of the land is 15 m Q
more than its width. Find the area of the largest plot for
planting the vegetables.

PERIMETER

Triangles Parallelograms Kites Trapeziums

a a a a
c b c d
CHAPTER
CHAPTER
10 b b
10
a b b
a b
P = a + b + c P = 2a + 2b P = 2a + 2b P = a + b + c + d
AREA

Triangles Parallelograms Kites Trapeziums
a
b b a t
b
a a b
1 1 1
A = ab A = ab A = ab A = (a + b)t
2 2 2

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242
Chapter 10
Chapter 10

10 TB Math F1.indd 242 11/10/16 12:19 PM