1. How do you feel?
𝐂=𝟐×𝝅×𝒓 𝐀=𝝅× 𝒓 𝟐

2. Pg 184 Exercise 9d No. 6-10 𝐂=𝟐×𝝅×𝟔𝟎 𝐀=𝝅× 𝟔𝟎 𝟐 𝐂=𝟑𝟕𝟔.𝟗𝟗𝐜𝐦
Perimeter
𝐂=𝟐×𝝅×𝒓
Area
𝐀=𝝅× 𝒓 𝟐
No. 6
𝐂=𝟐×𝝅×𝟔𝟎
𝐂=𝟑𝟕𝟔.𝟗𝟗𝐜𝐦
𝐀=𝝅× 𝟔𝟎 𝟐
𝐀=𝟏𝟏𝟑𝟎𝟗.𝟕𝟑 𝒄𝒎 𝟐

3. Pg 184 Exercise 9d No. 6-10 𝐂=𝟐×𝝅×𝟑.𝟖 𝐀=𝝅× 𝟑.𝟖 𝟐 𝐂=𝟐𝟑.𝟖𝟖𝐦 𝐀=𝟒𝟓.𝟑𝟔 𝒎 𝟐
Perimeter
𝐂=𝟐×𝝅×𝒓
Area
𝐀=𝝅× 𝒓 𝟐
No. 7
𝐂=𝟐×𝝅×𝟑.𝟖
𝐂=𝟐𝟑.𝟖𝟖𝐦
𝐀=𝝅× 𝟑.𝟖 𝟐
𝐀=𝟒𝟓.𝟑𝟔 𝒎 𝟐

4. Pg 184 Exercise 9d No. 6-10 𝐀=𝝅× 𝟏.𝟕𝟓 𝟐 𝐂=𝟐×𝝅×𝟏.𝟕𝟓 𝐀=𝟗.𝟔𝟐 𝒌𝒎 𝟐
Perimeter
𝐂=𝟐×𝝅×𝒓
Area
𝐀=𝝅× 𝒓 𝟐
No. 8
d = 3.5km so r = 1.75km
𝐂=𝟐×𝝅×𝟏.𝟕𝟓
𝐂=𝟏𝟏.𝟎𝟎𝐤𝐦
𝐀=𝝅× 𝟏.𝟕𝟓 𝟐
𝐀=𝟗.𝟔𝟐 𝒌𝒎 𝟐

5. Pg 184 Exercise 9d No. 6-10 𝐂=𝟐×𝝅×𝟖𝟎 𝐀=𝝅× 𝟖𝟎 𝟐 𝐂=𝟓𝟎𝟐.𝟔𝟓𝐦
Perimeter
𝐂=𝟐×𝝅×𝒓
Area
𝐀=𝝅× 𝒓 𝟐
No. 9
𝐂=𝟐×𝝅×𝟖𝟎
𝐂=𝟓𝟎𝟐.𝟔𝟓𝐦
𝐀=𝝅× 𝟖𝟎 𝟐
𝐀= 𝟐𝟎𝟏𝟎𝟔.𝟏𝟗𝒎 𝟐

6. Pg 184 Exercise 9d No. 6-10 Perimeter 𝐂=𝟐×𝝅×𝒓 Area 𝐀=𝝅× 𝒓 𝟐 𝐀=𝝅× 𝟒 𝟐
𝐂=𝟐×𝝅×𝟒
𝐂=𝟐𝟓.𝟏𝟑 𝐜𝐦
𝐂÷𝟐=𝟐𝟓.𝟏𝟑 ÷𝟐=𝟏𝟐.𝟓𝟕𝒄𝒎
Perimeter =𝟏𝟐.𝟓𝟕 + 𝟖 = 𝟐𝟎.𝟓𝟕𝒄𝒎
𝐀=𝝅× 𝟒 𝟐
𝐀= 𝟓𝟎.𝟐𝟕𝒄𝒎 𝟐
𝐀÷𝟐=𝟓𝟎.𝟐𝟕÷𝟐=𝟐𝟓.𝟏𝟑 𝒄𝒎 𝟐

7. Pg 184 Exercise 9d No. 14, 15 (Area only), 16 (cm)
Perimeter
𝐂=𝟐×𝝅×𝒓
Area
𝐀=𝝅× 𝒓 𝟐
No. 14
d = 18mm so r = 9mm
𝐂=𝟐×𝝅×𝟗=𝟓𝟔.𝟓𝟓𝒎𝒎
𝐂÷𝟐=𝟓𝟔.𝟓𝟓 ÷𝟐=𝟐𝟖.𝟐𝟕𝒎𝒎
Perimeter =𝟐𝟖.𝟐𝟕 +𝟏𝟖+𝟏𝟖+𝟏𝟖
Perimeter =𝟖𝟐.𝟐𝟕𝐦𝐦
𝐀=𝝅× 𝟗 𝟐
𝐀= 𝟐𝟓𝟒.𝟒𝟕𝒎𝒎 𝟐
𝐀÷𝟐=𝟐𝟓𝟒.𝟒𝟕÷𝟐=𝟏𝟐𝟕.𝟐𝟑 𝒎𝒎 𝟐
Area of square =𝟏𝟖 × 𝟏𝟖 =𝟑𝟐𝟒 𝒎𝒎 𝟐
Area =𝟏𝟐𝟕.𝟐𝟑 + 𝟑𝟐𝟒=𝟒𝟓𝟏.𝟐𝟑 𝒎𝒎 𝟐

8. Pg 184 Exercise 9d No. 14, 15 (Area only), 16 (cm)
𝐀=𝝅× 𝒓 𝟐
𝐀 𝐨𝐟 𝐛𝐢𝐠 𝐜𝐢𝐫𝐜𝐥𝐞=𝝅× 𝟏𝟐 𝟐 =𝟒𝟓𝟐.𝟑𝟗 𝒄𝒎 𝟐
𝐀 𝐨𝐟 𝐬𝐦𝐚𝐥𝐥 𝐜𝐢𝐫𝐜𝐥𝐞=𝝅× 𝟓 𝟐 =𝟕𝟖.𝟓𝟒 𝒄𝒎 𝟐
𝐀 𝐨𝐟 𝐠𝐫𝐞𝐞𝐧 𝐬𝐡𝐚𝐩𝐞=𝟒𝟓𝟐.𝟑𝟗−𝟕𝟖.𝟓𝟒=𝟑𝟕𝟑.𝟖𝟓 𝒄𝒎 𝟐

9. Pg 184 Exercise 9d No. 14, 15 (Area only), 16 (m)
Perimeter
𝐂=𝟐×𝝅×𝒓
Area
𝐀=𝝅× 𝒓 𝟐
No. 16
𝐂=𝟐×𝝅×𝟏𝟔=𝟏𝟎𝟎.𝟓𝟑𝒎
𝐂÷𝟒=𝟏𝟎𝟎.𝟓𝟑 ÷𝟒=𝟐𝟓.𝟏𝟑𝒎
Perimeter =𝟐𝟖.𝟐𝟕 +𝟏𝟔+𝟏𝟔+𝟏𝟔+𝟏𝟔
Perimeter =𝟖𝟗.𝟏𝟑𝐦
𝐀=𝝅× 𝟏𝟔 𝟐
𝐀= 𝟖𝟎𝟒.𝟐𝟓𝒎 𝟐
𝐀÷𝟒=𝟖𝟎𝟒.𝟐𝟓÷𝟒=𝟐𝟎𝟏.𝟎𝟔 𝒎 𝟐
Area of square =𝟏𝟔 × 𝟏𝟔 =𝟐𝟓𝟔 𝒎 𝟐
Area =𝟐𝟎𝟏.𝟎𝟔 +𝟐𝟓𝟔=𝟒𝟓𝟕.𝟎𝟔 𝒎 𝟐

10. Circle Revision Worksheet
For Friday 28th April