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primary 5 | Maths | Area & Volume
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Clarine Peh
Clarine Peh

primary 5 chevron_right Maths chevron_right Area & Volume chevron_right Singapore

Please help, thank you

Date Posted: 11 months ago
Views: 53
J
J
11 months ago
Area of rectangle = length SR x breadth RQ
= 10 units

Area of triangle D
= 1/2 x vertical height x SR = 3 units

Since area of triangle D = 3/10 of area of rectangle,

1/2 x vertical height = 3/10 of RQ

Vertical height = 6/10 of RQ = 3/5 of RQ


Since RQ = vertical height of triangle B
+ vertical height of triangle D,

Vertical height of triangle B
= 2/5 of RQ

Triangle B area = 2/5 of RQ x 1/2 x SR
= 2/10 x RQ x SR
= 1/5 x area of rectangle
= 2 units

So 58 cm² = 2 units

1 unit = 29 cm²

Rectangle area = 10 units
= 29 cm² x 10
= 290 cm²

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7 answers (A Helpful Person)
1st
the green lines are the heights of each triangle! hope this helps :)