Question

primary 6 | Maths | Geometry

Anyone can contribute an answer, even non-tutors.

Mag Chan

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Help needed.

Date Posted: 2 weeks ago
Views: 5
J
2 weeks ago
a) For area of A,

Subtract the area of the inner circle from the area of square WXYZ to get the area of the 4 corners.

Each is equal to A. So divide by 4 to get your answer.

b)

Draw a straight line from X to Z, and from W to Y. Now square WXYZ is divided into 4 equal triangles. The area of each triangle is just ¼ of the area of the square.

Notice that areas B and C can be combined to form a triangle. This triangle is identical to each of the 4 triangles , and has the same area.

Final answers for a) and b) are 3.43cm² and 19.43cm² respectively , correct to two decimal places.
Mag Chan
2 weeks ago
Thank you for the tips but I get 19.43 for (b) as 1/4 of 64 is 16 (B+C) add 3.43 (A), total 19.43cm2. Did I do wrongly?
J
2 weeks ago
Your working is correct. Typo error on my side. Have edited.
Mag Chan
2 weeks ago
Thank you so much. Your explanation is v clear. Thumbs up!!
J
2 weeks ago