ATAR Notes: Forum

HSC Stuff => HSC Maths Stuff => HSC Subjects + Help => HSC Standard Mathematics => Topic started by: mylinh-nguyen on October 20, 2017, 04:33:43 pm

Title: Volume
Post by: mylinh-nguyen on October 20, 2017, 04:33:43 pm
Need some help on this question
Title: Re: Volume
Post by: Shadowxo on October 20, 2017, 04:44:07 pm
Quote from: mylinh-nguyen on October 20, 2017, 04:33:43 pm
Need some help on this question
The area of the semicircle is half the circle,1/2*π*r2. r=5 as the diameter is 10cm and radius is half the diameter. The area of the rectangle is length*height which is simply (18-5) * 10, as the length is the total length minus the radius.
Volume is just this total area * width, where width is 28cm
b is just finding the perimeter.
Title: Re: Volume
Post by: mylinh-nguyen on October 20, 2017, 07:14:59 pm
Quote from: Shadowxo on October 20, 2017, 04:44:07 pm
The area of the semicircle is half the circle,1/2*π*r2. r=5 as the diameter is 10cm and radius is half the diameter. The area of the rectangle is length*height which is simply (18-5) * 10, as the length is the total length minus the radius.
Volume is just this total area * width, where width is 28cm
b is just finding the perimeter.

Oh ok thanks!!