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primary 6 | Maths | Geometry
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Matthew wan
Matthew Wan

primary 6 chevron_right Maths chevron_right Geometry

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Date Posted: 6 years ago
Views: 410
Crystal Tham
Crystal Tham
6 years ago
Triangle ADC is half of Rectangle ACYZ.

Area of triangle ADC = 1/2 X 8cm (AB = DC) X 12cm (AD = BC) = 48cm2

Area of Rectangle ACYZ = 48cm2 X 2 = 96cm2
J
J
6 years ago
The question is asking for the breadth of
ACYZ.

ADC = 48 cm² (refer to above comment).

Notice that the vertical height of ADC is the same as the breadth of ACYZ. And it's base is just the length of ACYZ. So that's why it's ½ of ACYZ.


Area of ADC = ½ x vertical height x base
Area of ADC = ½ x breadth of ACYZ x length of ACYZ

48 cm² = ½ x breadth of ACYZ x 15 cm

Breadth of ACYZ

= 48 cm² ÷ ½ ÷ 15 cm

= 6.4 cm
J
J
6 years ago
Alternatively, knowing that ADC is half of
ACYZ,

area of ACYZ = 48 x 2 = 96 cm²

Breadth of ACYZ = area ÷ length

= 96 cm² ÷ 15 cm
= 6.4 cm

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KingKong
Kingkong's answer
28 answers (A Helpful Person)
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Ans: 6.4cm