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P6 Mathematics

Question post on Tue, 29/09/2020 7:19pm

Can someone assist me to find perimeter and area shaded part this figure. Thanks

bbcxd · Answer 1 · Post on Wed, 30/09/2020 11:43am

The repeated shaded area between the circle and the square is a 1/4 circle.

Hence the shaded area = Area of the square – Area of the 1/4 circle – Area of the 1/4 circle + Area of the circle

Shaded area = Area of the square + Area of the 1/2 circle

= 10² + 1/2 × 5²π

Assume π = 3.14

Shaded area = 100 + 39.25 = 139.25 cm²

QiwQiw · Answer 2 · Post on Wed, 30/09/2020 3:04pm

QiwQiw Post on Wed, 30/09/2020 3:04pm

How Perimeter?

bbcxd · Answer 3 · Post on Wed, 30/09/2020 4:36pm

If you flap the corner 1/4 circle in white horizontally 180 degree

Perimeter = Perimeter of the circle + 5 x 4 = 2 x 5π + 20 = 31.4 + 20 = 51.4 cm