Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.



Question

primary 6 | Maths | Ratio
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question
Catherine
Catherine

primary 6 chevron_right Maths chevron_right Ratio chevron_right Singapore

Help me with this question and Explain

Date Posted: 3 months ago
Views: 50
Eric Nicholas K
Eric Nicholas K
3 months ago
Let radius be 1 unit for each quarter circle ("quadrant").

Length of rectangle = 2 units + 17 cm
Breadth of rectangle = 2 units + 3 cm

Difference = 14 cm

Since length : breadth = 12 : 5 with a difference of 7,

7 ratio units (not the same as the radius units which I introduced earlier) --> 14
1 ratio unit --> 2
12 ratio units --> 24
5 ratio units --> 10

So the length of the rectangle is 24 cm and the breadth of the rectangle is 10 cm.

2 units + 3 cm --> 10 cm
2 units --> 7 cm
1 unit --> 3.5 cm
Eric Nicholas K
Eric Nicholas K
3 months ago
Perimeter of the shaded part
= 4 x curved part of the quadrants + 2 x 17 + 2 x 3
= (a full circumference of a circle with radius 3.5 cm) + 34 + 6
= 2 x 3.14 x 3.5 + 40
= 21.98 + 40
= 61.98 cm

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
sheila
Sheila's answer
9 answers (Tutor Details)
1st
part a's answer.

With the answer to part a, you should be able to do part b! :)