Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
primary 6 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Please help I don't know how to do
Date Posted: 5 years ago
Views: 666
Alternative method :
Area of big square = 23cm x 23cm
= 529cm²
Area of the 8 identical right angled triangles
= Area of big square - area of small square
= 529cm² - 49cm²
= 480cm²
Area of 4 of those triangles
= 480cm² ÷ 2
= 240cm²
Area of the dotted-line square
= Area of 4 of those triangles + area of small square
= 240cm² + 49cm²
= 289cm²
Realise that 289cm² = 17cm x 17cm
So length of side of dotted-line square
= 17cm
Length of PQ = length of side of dotted-line square
= 17cm
Area of big square = 23cm x 23cm
= 529cm²
Area of the 8 identical right angled triangles
= Area of big square - area of small square
= 529cm² - 49cm²
= 480cm²
Area of 4 of those triangles
= 480cm² ÷ 2
= 240cm²
Area of the dotted-line square
= Area of 4 of those triangles + area of small square
= 240cm² + 49cm²
= 289cm²
Realise that 289cm² = 17cm x 17cm
So length of side of dotted-line square
= 17cm
Length of PQ = length of side of dotted-line square
= 17cm
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Done.
Date Posted:
5 years ago
360 Tutoring Program