Hello, can i get help for this question pls. Thanks

# STUCK ON HOMEWORK?

## ASK FOR HELP FROM OUR KIASUPARENTS.COM COMMUNITY!

# Question

# Answer

In my rusty memory, its Area of circle divide by four , that’s the total area of the sector, that is Pi R sq X theta by 360 = 3.141x40x40x(90/360) = 1256.6 sq cm

As its a part of the circle, the radius is same i.e. 40, remainder part of the radius from B to circumference would be 40-28 = 12 cm.

the smaller semicircle at bottom showing BC as tangent perpendicular to radius parallel, indicate BC would also be 12 cm. As CD is supposed to 3/2 of BC,CD will be 18 cms, making BD 30 CM

the area of 30×28 rectangle = 840 Sq cm ,

the area of remainder top triangle 1/2 base x ht = 1/2x28x10, = 140 Sq cm

the remainder bottom triangle 1/2 base x ht. = 1/2 30(BD) x 12. = 180 Sq cm

Removing these areas from Area of the square = 1256.60 – (840+140+180) = 96.6 Sq Cm

Again its from my old rusty memory of Math forumalae, so plz dont accept it without double checking yourself.

Get it double checked.

interesting problem though.

Thanks

In my rusty memory, its Area of circle divide by four , that’s the total area of the sector, that is Pi R sq X theta by 360 = 3.141x40x40x(90/360) = 1256.6 sq cm

As its a part of the circle, the radius is same i.e. 40, remainder part of the radius from B to circumference would be 40-28 = 12 cm.

the smaller semicircle at bottom showing BC as tangent perpendicular to radius parallel, indicate BC would also be 12 cm. As CD is supposed to 3/2 of BC,CD will be 18 cms, making BD 30 CM

the area of 30×28 rectangle = 840 Sq cm ,

the area of remainder top triangle 1/2 base x ht = 1/2x28x10, = 140 Sq cm

the remainder bottom triangle 1/2 base x ht. = 1/2 30(BD) x 12. = 180 Sq cm

Removing these areas from Area of the square = 1256.60 – (840+140+180) = 96.6 Sq Cm

Again its from my old rusty memory of Math forumalae, so plz dont accept it without double checking yourself.

Get it double checked.

interesting problem though.

Thanks

**Find Tuition/Enrichment Centres**