S CRM 3.2 Lesson 4/5

Area of Semi-Circles and Composite Figures

S CRM 3.2 Lesson 4/5

Area and Circumference of Semi-Circles

Find the area or circumference of a whole circle, then cut it in half!

Area of Polygons

• Parallelogram:  $A=b\cdot h$  

  where b=base length, and h=height

• Triangle:   $A=\frac{1}{2}b\cdot h$                                                                     where b=base length and h=height (perpendicular to one another)

• Trapezoid:   $A=\frac{1}{2}h\left(b_1+b_2\right)$                                                    where  $b_1$  and  $b_2$  are the two bases and h=height

Composite Figures

A figure that is made up of multiple familiar shapes.

Find the area of the attached composite figure.

Find the area of the attached composite figure.

Multiple Choice

Find the area:

• 84 m²

• 168 m²

• 112 m²

• 56 m²

Multiple Choice

Find the area of the trapezoid

• 36 meters squared

• 72 meters squared

• 18 meters squared

Multiple Choice

• 17 units²

• 20 units²

• 10 units²

• 16 units²

Multiple Choice

What does area mean?

• the distance around a shape

• half the distance around a shape

• the amount of space outside a shape

• the amount of space inside a shape

Multiple Choice

A triangle with a height of 11 ft and a base of 8 ft has an area of what?

• 88 ft squared

• 19 ft squared

• 3 ft squared

• 44 ft squared

Multiple Choice

What is the area?

• 56 square cm

• 28 square cm

• 32 square cm

• 19 square cm

Multiple Choice

What is the area?

• 56 square cm

• 28 square cm

• 32 square cm

• 19 square cm