Objectives

Material Taken From:

Mathematicsfor the international student

Mathematical Studies SL

Mal Coad, Glen Whiffen, John Owen, Robert Haese, Sandra Haese and Mark Bruce

Haese and Haese Publications, 2004

Objectives

• To find the area of a closed figure• To find the surface area of a 3D

Find the area of:

3) 4)

Chapter 11 – Section C – Area- Area formulae found on page 365 -

Find the area of:

5) 6)

Find the area of:

7) 8)

Find the area of:

9) 10)

11) A 15m by 8m rectangular garden consists of a lawn with an inner rectangle (7m × 4m) of

flowers. Find the area of the lawn.

1) A triangular advertising sign has base 1.6 m and area 2 m2. Find its height.

Chapter 11 – Section D – Word Problems

2) A rectangular lawn is 12 m by 8 m and a 3.2 m square garden bed is dug out of the lawn. The

lawn is then reseeded with boxes of seed, where each box costs $8.50 and covers 18 m2. Find:

a)the area of the lawnb)the number of boxes of seed requiredc)the total cost of the seed.

Solids with Plane Faces• Surface area of a solid with plane faces is the

sum of the areas of the faces.

Chapter 11 – Section E – Surface Area

1) Find the surface area of the rectangular prism:

Cylinder Cone Sphere

Objects with curved surfaces

22 2SA rh r 2SA rs r 24SA r

3) Find, the surface area of:

4) Find the outer surface area of:

5) The length of a hollow pipe is three times its radius. If its surface area is 301.6 m2, find its radius.

Homework

• 11C.2, pg 366– #1c, 2a, 4b, 6c

• 11C.3 pg 368– #1b

• 11C.4, pg 369– #1bc, 3ac

• 11D, pg 370– #2b, 5, 7

• 11E. 1, pg 375– #1b, 2, 4

• 11E.2, pg 376– #1cdf, 6