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primary 6 | Maths | Measurement
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Jan
Jan

primary 6 chevron_right Maths chevron_right Measurement chevron_right Singapore

I have no clue on how to do this

Date Posted: 3 years ago
Views: 194
AC Lim
AC Lim
3 years ago
Area of each unshaded parts are equal.
Therefore, 118 ÷ 2 = 59
Area of 1 triangle include the shaded part = ½×10×14=70

So, shaded parts = 70-59=11cm².
Hope this helps.

See 1 Answer

Area of each unshaded parts are equal.
Therefore, 118 ÷ 2 = 59
Area of 1 triangle include the shaded part = ½×10×14=70
So, shaded parts = 70-59=11cm².
Hope this helps.
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AC Lim
Ac Lim's answer
12073 answers (A Helpful Person)
1st
Jan
Jan
3 years ago
I hope this is correct
J
J
3 years ago
It is correct.

A slightly different way to do this question:

Since the triangles are identical, we can tell from the info of both triangles that the height is 10cm and base is 14cm.

Area of 2 identical triangles

= 2 x (½ x base x height)
= 2 x ½ x 10cm x 14cm
= 10cm x 14cm
= 140cm²

Now,

Left unshaded part + 1 shaded part = 1 triangle.

Right unshaded part + 1 shaded part
= the other triangle (same area as the first)


Add them together,

All the unshaded parts + 2 shaded parts = 2 triangles area

So 2 shaded parts = 2 triangles area - all the unshaded parts

= 140cm² - 118cm²
= 22cm²

1 unshaded part = 22cm² ÷ 2 = 11cm²