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primary 5 | Maths | Area & Volume
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Babi
Babi

primary 5 chevron_right Maths chevron_right Area & Volume chevron_right Singapore

What fraction of the figure is shaded?

Date Posted: 9 months ago
Views: 83
J
J
9 months ago
Area of the 102cm² △
= ½ x rectangle length x △'s vertical height

Area of 90cm² △
= ½ x rectangle length x △'s vertical height

Combined area
= 102cm² + 90cm²
= 192cm²

= ½ x rectangle length x combined vertical height of the two △
= ½ x rectangle length x rectangle breadth

(The sum of their vertical heights is equal to the breadth of the rectangle)

= ½ x area of rectangle.

Area of rectangle = 192cm² x 2
= 384cm²

Shaded area = 384cm² - 192cm² - 114cm²
= 78cm²

Fraction = 78/384
= 13/64

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Phylicia Tong
Phylicia Tong's answer
192 answers (A Helpful Person)
1st
Hope you understand why areas A plus B is half of e rect.