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primary 5 | Maths | Area & Volume
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Arlet Clinth
Arlet Clinth

primary 5 chevron_right Maths chevron_right Area & Volume chevron_right Singapore

How do I even start?

Date Posted: 3 months ago
Views: 26
Eric Nicholas K
Eric Nicholas K
3 months ago
Area of the largest rectangle (which is the 12 cm by 12 cm square, in fact)
= 12 x 12
= 144 cm^2

Area of left side unshaded region (that triangle with 4 cm and 12 cm)
=1/2 x 4 x 12
= 24 cm^2

Area of top right unshaded region (that triangle with 4 cm and 8 cm)
= 1/2 x 4 x 8
= 16 cm^2

Area of bottom unshaded region (that triangle with 8 cm and 12 cm)
= 1/2 x 8 x 12
= 48 cm^2

Area of shaded triangle
= 144 - 24 - 16 - 48
= 56 cm^2

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Lee Jun Ying Marcus
Lee Jun Ying Marcus's answer
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